Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5736e5209897e7…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 23:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c57e7ac522b271668bc20b2dd80ecfe2 SHA-1: 859a29117892403ce2d5cc2d90d62f931fa776d3 SHA-256: 0f5736e5209897e773d3be64e7c0a83735c855e0e488a8289176c616c33db0f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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 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 https://pistant.ru/uplcv?utm_term=hunter+x+hunter+chimera+ant+arc+full+episode PDF link annotation
    • https://siriusdynamics.com/assets/uploads/files/konufelakilutoli.pdfIn PDF document text
    • http://eksternest.be/images/file/72725035247.pdfIn PDF document text
    • http://moneymaker-gold.de/files/56702577885.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210917051646.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/pitewijimaviborewofe.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/36821100075.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210903195501.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/satilexofifokosipika.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/cb1c45676a29c9184fac45c91eeb9e76/jezomokurubukujiz.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lii93tr4rbpc0dh206mt973bd0/30312892596.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161318bfc5c596---43905996671.pdfIn PDF document text
    • https://mbp.hastatis.com/mbp/upload/images/images/upload/ckfinder/56725671461.pdfIn PDF document text
    • http://corkpotters.com/images/27938875606.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/bibafadalimujulewazoge.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/bcc4f9100fe213b8c26964d946295885/75618631754.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/tetevizajefurosabe.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16146dc65b54b3---50538073693.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3b0440e0---62224149797.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/bikulijilajenopepozozas.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/dobabomafusunuwezavosefo.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/96236904202.pdfIn PDF document text
    • https://menu2uplus.com/images/file/77687026594.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/52168436911.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/8444592700.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210913_536BE3CC1FA52EAB.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/kenubutonefedo.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC905 15304 bytes
SHA-256: d3dcb892f301a308cf2f5d03e61e8bb62109b3de62c738240a3636932a089a03
font_02_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 11080 bytes
SHA-256: d3d3e512b1a656dbd2eb1d2fcd25864b6881e3466a5dac5f85a98985f57a8d65

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