Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b538408cac4032…

MALICIOUS

PDF

86.3 KB Created: 2021-08-08 21:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f85f50b086ac5fa82692ae7dd91e01d8 SHA-1: be1e2ecac2e3b641f4a1f348af2f0df20da5e71a SHA-256: 61b538408cac40327b35e59c0e1b9d213da3da0dcf951b124a79c8f235b3cf59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm nature imply it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://anhuizpyy.com/upload_fck/file/2021-5-8/20210508010021604242.pdf In PDF document text
    • https://limberhurstgallery.com/imageuploads/file/manadulazuzapejit.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/7a807d3b14e7e415da212658d6712e2b/vinipixuvi.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23759d038d---dagodafonekivatosobopi.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/54938001392.pdfIn PDF document text
    • http://asfcursillo.com/clients/879797/File/zuvenovuzivulukumira.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c49e8172788217de9db61ad5c365f549/xogus.pdfIn PDF document text
    • http://abpaluso.com/upload/file/kemigenebiz.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/ragezuvanel.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9d1191e6a4359356ad61caf46cadda4f/82870963494.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3d77c5d30---14747380390.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/rurerekakokutaraze.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/98c7be151309a408c4a6f2869b36a1df/ponan.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/98870578498.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/42291532379.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/85519015970.pdfIn PDF document text
    • http://teresachild.com/upload/files/20484705908.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ca8cd0c0544---zojenovopej.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/mazewimojakefuv.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/18185958842.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/e599f7d703a47512a7c8dc8c2560bd73/59522112300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=incident+countee+cullen+literary+analysisPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/dizuwubub.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_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 17692 bytes
SHA-256: 2ca1ef99e5f7bbfb2771c41b90e9263d7a2c9f438cb7c01c6b10b1abc5b3496a
font_01_sfnt_off00011c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C04 10528 bytes
SHA-256: 41e024015bfaee8fd6235f5d5c2622a090799364842395ad8d97ec8d5e3e9575
font_02_sfnt_off00013428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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