Malicious PDF — malware analysis report

Static analysis result for SHA-256 c986bd675a267254…

MALICIOUS

PDF

98.1 KB Created: 2021-07-18 13:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20fa1f249e8a480e1678c837ca4ae52f SHA-1: 76cfa7ab2863b136c8b0d46d1d3bd26f391744f2 SHA-256: c986bd675a2672541feac3a64d285dd208abd86314ebdf185222ea50ea1436cd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to a common tactic for delivering malicious payloads or harvesting credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://tiyuchangdi.com/upload_files/files/20210717_174855.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7b675cd61aa512fc6cbe8213b94f6219/20295406954.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/tapezugemubiraveb.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33fc877c97---80360222489.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ca9dbe926087abe6bf3674396928ce23/dakudotito.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/moboxit.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d77bcb7336---88528742778.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e95f873f240---xotinuroxubaz.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dtadqopb8fh886nufm17tiut21/9628659569.pdfIn PDF document text
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/31733485000.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/bijiwemepovatusika.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ssijnr3odtirhi2euni5qap24f/83096820084.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee0456e141---sekapufetovulixezamejubi.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/guzekofosudakururi.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b47d3c83f15---79024701524.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/25191218929.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9sq2o7qgqnkddc5lm936hc74ui/37800881698.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4ed0493645db45cccbab8ebf90487f94/dapavilafafel.pdfIn PDF document text
    • http://aimic.com/userfiles/file/ripemozukajutawabirin.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/wokevazolov.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/2065a9f0a564ae4ea9393c0221662e57/24896463675.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/8a1d6f567f5ad6a06d1add6f778d4f50/jedenarajowibozemeze.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/23886511324.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c432afcd3a7---taxilolazokewelerara.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609623e00cf2c---fotegixalipozexoxugumire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=3x2+contingency+tablePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 17808 bytes
SHA-256: 8263f76c920b5dbbaf526219ff1ea710f121e4d4bb3220e1b5290db471ea061d
font_02_sfnt_off0001315c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315C 17896 bytes
SHA-256: 338480d9dc17c9c8b3cbcd71e82b78344b6e555b2027c55eb5f67e8064089508
font_03_sfnt_off00016036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16036 10688 bytes
SHA-256: f2b6ca9ea7fafa002411fd0faf0bc2610845d00e4e27c2c995a7c6705d936a91