Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98cbfe18c68796f…

MALICIOUS

PDF

85.9 KB Created: 2021-10-16 02:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8b2b1288a34b1823b43918b072dabf6b SHA-1: fefe490b9ef1a2cb54d9709387e24d5f50d3c74c SHA-256: f98cbfe18c68796f43e0cfd1c77add6ba6adf1203f8e4a49f16f182975f45901
184 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting suggests an attempt to deliver a payload or phish for credentials. The 'Callback Phishing Lure' heuristic further supports a social engineering attack, likely aiming to trick users into calling a fraudulent number or visiting a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=whether+or+not+means PDF link annotation
    • http://checopharma.com/upload/files/kopaparokamiwoveme.pdfIn PDF document text
    • https://mcgbaharat.com/userfiles/file/66684108283.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/9194005564.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/1702467282.pdfIn PDF document text
    • https://esz.jp/img/editor/files/61394624112.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/mevolebes.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/96392298320.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/59656076676.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/56014803656.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/43804511415.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/a120ca3481396a395ba2dddba91891f4/guvasewezamotojip.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/29997583755.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/mifejujumazabuwijap.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/55599622267.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/95751378228.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b7cd20249054579c04dc5e9c186af103/jiwamovuwa.pdfIn PDF document text
    • https://okul.gencreklamajansi.com/uploads/files/63998134884.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202195101535660.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c090b81c61e3073228d0baac42d43a30/85171488926.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/bevodesidoj.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/46258422169.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/juzasunipodeximurobazitet.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ng1d03tnih9ecjffs8n2nvppib/borozaxupamalukun.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141c499650c7---lakevabatenugu.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_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 10228 bytes
SHA-256: 31c295a8fa199ff1ede4b95c844e9c78a1487435697adee3da4be09ea0f3a65a
font_01_sfnt_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 16992 bytes
SHA-256: 7c549dc9bf484d7ddc39f2da2a44315a2ed3de6d8386c3187e6d3e4719c49b6e

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