Malicious PDF — malware analysis report

Static analysis result for SHA-256 98610ae522f19652…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 15:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84ed38574466c076cf00c09040760253 SHA-1: 658bf4f9241b6de7c73365759f2d09105b8ce788 SHA-256: 98610ae522f19652bba0b56ae19c4ee1e91885e83ac68b8fbf91ddd44486bd91
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign, likely using a link farm to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 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 http://www.siphonicflowmandiri.com/upload/files/21320207460.pdf In PDF document text
    • https://truongthanhco.vn/webroot/img/files/84568568515.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/36769779397.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/72874174870.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/vabep.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/8383183636.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/sufademutozorefak.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/tonuxoxorewasete.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/41125399299.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6vt2p3bokiaon8ke1u252fnull/xurugonebigozetaniw.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/dowuzije.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/rafefogejamugoluluwexiwa.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/30889013242.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/19911884271.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/73770623322.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/woxisarizoxesigeloku.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/24920468667.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/70296617626.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/fotuvinozujukizizikogupev.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613c9e52d998c---59332453793.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67c9a34af---8437840323.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/lozug.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/d9nrlf9b6r0bvelh34tkkdpvpc/kuzotelosozatinasoxogaj.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/dimifexudukuja.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/pudurabadibaliraribuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mini+militia+ultra+god+mod+apk+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 17564 bytes
SHA-256: 626a64e7b140f4c444fcad030e60c59130b61ef51cf5c3f3d26ec4329bfb4a27
font_01_sfnt_off00010892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A9 10704 bytes
SHA-256: 74b13f1c4b94115d00e19486bb71cd13ce844edbc09112448b6abc136a450f8a

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