Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6e427e8410f587…

MALICIOUS

PDF

93.4 KB Created: 2021-09-07 01:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d5e67c839156b6f4e0a9a76258ebccc3 SHA-1: 79140f0ae68aef241402947cf3a3276d69942580 SHA-256: 3d6e427e8410f587b0fe89de620b1ee0a50bcea5eb9d79ce4e7f8807fcffc4ba
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains, likely to host malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams or credential phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://irlanc.ru/uplcv?utm_term=internship+project+report+on+export+house+pdf PDF link annotation
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee2797685a---gipawatejarizax.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d1cafaa09ca62744395d11384add368b/13230844824.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5b72686a9---94511193336.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50682672ac---metovorozikug.pdfIn PDF document text
    • http://grimastone.ru/files/nijugikeruboluwifawamux.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5438daca8---sevuf.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210730_4C15C79FCFE31748.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4580808516---64295792348.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a80800e2e---31059549488.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/nexulopuvaga.pdfIn PDF document text
    • http://csp.hu/editor_up/jusewalatijiresokilosij.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/50798710674.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/2691154713.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/wagaxa.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/39055537acf1a4084864dd0eb1a4eb70/zudoxojajarozokajeje.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/65645458847.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/f53d936e06849050c51cadb91d5b61ee/74013235618.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607135bdb9d4c---nigup.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/kanaw.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092333a005a1---rogadaretolakovipow.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/jvd87nt5ral76u438lg1aqiha1/ragedakamowowizilid.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/49257435644.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca326eafa2---87546621621.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/kakevuwisejoxirevarus.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/vimikopazeporexevuze.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/fisapenilim.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_off00010545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10545 18572 bytes
SHA-256: 955294b895e6813921ee3e9e9271c9edc9e16ea00e333bb016f708fb2b7baea3
font_01_sfnt_off00013635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13635 10792 bytes
SHA-256: 38fafb53796f9701e23d825e4bc3f2b72cf48dff89f12dacc5d152edb801d500
font_02_sfnt_off00014f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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