Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6908296c00c7812…

MALICIOUS

PDF

80.5 KB Created: 2021-10-09 04:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 39f0851337d50f3208a4c8d2297ade1b SHA-1: 53aea6b66d7da905ce3ba018a9d322e92aff6a11 SHA-256: b6908296c00c7812d691a0624189ff04dc4dc2b5264f63a6068d7d23e035f0ac
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting sites. The 'SE_CALLBACK_LURE' heuristic suggests the document may be designed to trick users into calling a fraudulent support number, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://catamma.ru/uplcv?utm_term=eleventh+circuit+court+of+appeals PDF link annotation
    • https://gilbertems.com/videos/file/rulabelewatepedo.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/9524369269.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/10369084103.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20211008105844_1225375337.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/87674058835.pdfIn PDF document text
    • http://bebcardkw.com/ckeditor-ckfinder-integration/uploads/files/xoweze.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/87569720309.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/80439363730.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/45517541379.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/tagalupakepos.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/15ab42071f3d611e1f3ca4cc634c1b30/48640426444.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/javuwuginoz.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1615589ed3d52c---relozupudune.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/37449437169.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/pulidatajonoriminule.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/29191912942.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/zelimimijalekaxopoj.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/divavozefoludoxusasavepew.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/gizubibug.pdfIn PDF document text
    • http://skupka23.ru/upload/m/75431245328.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/47594438258.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139424c3de01---46858890120.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_off0000d4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F3 10728 bytes
SHA-256: c0f5728433e832e6ab90b916a2297b54d9c8fdc77549fe71897ed8bef640bd25
font_01_sfnt_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 18080 bytes
SHA-256: 12e15f6f58eefe2b3179f70ccd96887e50cbfe7a0f920fb5e71c9f1d17056d56
font_02_sfnt_off00011c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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