Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26a1b6e2cf54f6e…

MALICIOUS

PDF

69.1 KB Created: 2021-10-01 12:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50ba2b19a9e30045fb8b8d8b57090021 SHA-1: 23cf8ede6baa944cdc3a384a83f2e0f1c9130d70 SHA-256: b26a1b6e2cf54f6e25c765da759d98f17b3d316d1aca142faa88891ec1f93944
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document may also attempt to trick users into making phone calls, a common tactic in phishing and tech-support scams. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=experiencing+the+lifespan+5th+edition+free+pdf PDF link annotation
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/f8mr9fgd5e9uv1kq07tjfjq037/2409735485.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/xapijam.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161514408e7015---degaxewumofowitanem.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318fc4ab00f---xepegilozusijazeladib.pdfIn PDF document text
    • http://7profi.net/userfiles/file/90967875249.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/kuleretafotiwubunaregi.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/89588920437.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/gifojiminezujexunagi.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/10485368877.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/86277313528.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/a2e2q1e70a4licfjeuh0riaa2e/48686365428.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/89094936686.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415f9ddfb52---76085241504.pdfIn PDF document text
    • http://panova-art.com/files/file/bulakalej.pdfIn PDF document text
    • https://tekartltd.com/upload/files/78302958698.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/vudilozoseka.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/b12761351159faccd65391e647bc7f60/tapiw.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/kawilakavevakosadakewaxak.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/31446408295.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/zetapusaxobisadevinomaki.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/34943833719.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/4ba2822e176b2e2b70b6863d967c3b27/89322778158.pdfIn PDF document text
    • http://nensi.si/upload/file/sigixefibabivunulumi.pdfIn PDF document text
    • http://orenprom.com/img/account/file/xuvenemadapemid.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_off0000b048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB048 11120 bytes
SHA-256: 9dfc451cdfce99302527bc9e15b2f55f8a66cefc1afc87efcab84bf1b86375a8
font_01_sfnt_off0000ca00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA00 14608 bytes
SHA-256: 9ced33977c29fa5e1a9beffc161a5b32965f15fd8a18143772281e45c90c262b
font_02_sfnt_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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