Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b639abe4cf2a01…

MALICIOUS

PDF

93.9 KB Created: 2021-06-29 03:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 858aa92a47c1317c57e2628e55e71246 SHA-1: 078a4825d8177d5a5ed05d4f51e1e07e314afc48 SHA-256: f5b639abe4cf2a015ef1b5613cc6ba29ec324e76fcf1376a131b1bfb2d98d425
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on compromised WordPress sites, likely to host further malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick the user into calling a phone number, a common tactic in tech-support scams and callback phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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) or Microsoft license-boilerplate 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://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ujqvu8oai40e1p684g6a68tau4/29682803857.pdf In PDF document text
    • http://jcon-aps.dk/userfiles/file/21792642610.pdfIn PDF document text
    • http://gloria-eurex.com/ditewafujikuz.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/90491978309.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/24761233673.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7e5f40b36---6426384489.pdfIn PDF document text
    • http://agavietnam.com/img/files/molanaman.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/7436082f0dec3d78db2151a7c4f46635/jawovebejosoniweverifoz.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16095cee8c2d06---lugis.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/wubidajizapijiw.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/a3cn6pno22ej9s91i3pgegpk1i/jowizusener.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/55110377716.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/08b8b1d751d9aa1c99c125679508ce73/29899570079.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/36880948f96a270411e5f51dc2ddc0fe/xodusexapubo.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/4958587913.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/67480984231.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/84752200231.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/q82o7m6hsa7va11vpvqcqa58fe/kiworodurebaline.pdfIn PDF document text
    • http://fitviewer.de/files/file/79027236835.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/72oa36bmjpb3oo0ep9rsggj8g5/gafufizavokiwotidawixa.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/xosozavineg.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/80845207240.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/fdab3f60579cc25d26d8b758a76fcdb8/83105763802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=define+competitive+exclusionPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015006.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15006 17464 bytes
SHA-256: c99842fad21b6f79778088bb2c54f87f20171928d62ad2ea4b6376e63f817230
font_00_sfnt_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 21812 bytes
SHA-256: 3dac8bd8b87fbba6d61bd24ce78cbf8ed0869e500ea9f5ce6dbb88201506071e
font_01_sfnt_off000112c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD1 3216 bytes
SHA-256: 59adec3b5b78748d561d03743a5104ece5e2d81313bdedbb471ec8502e21ddec
font_03_sfnt_off0001379f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379F 10648 bytes
SHA-256: bdd7babc005e38f4b4992423bca67bb18d9c46e9363d1bc6efb81524c809a3b4

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