Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e4a64241fd6daf…

MALICIOUS

PDF

99.2 KB Created: 2021-07-23 10:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b69b11195eb3f09ea4eaf3d4ee9b975e SHA-1: 518b4e66b03dbc94c4d5d797edba4bb44ff84df7 SHA-256: d6e4a64241fd6dafc277d56a37343d7e2f583b60a746f33d2e9aa2ca784b86ec
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple PDF link farm heuristics further supports this. No scripts were extracted, but the overall structure and heuristic firings indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087596457d91---lizegujuxuleburema.pdf In PDF document text
    • http://lookkorea.net/userfiles/file/bitulazuxif.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609465aeaf172---19178017111.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72a01e2bb2---fokav.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/c71ed3169120d423a05f5e61b69cb471/65981388297.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/83876949722.pdfIn PDF document text
    • http://iworking.vn/uploads/files/xoselasijulir.pdfIn PDF document text
    • http://air-ned.com/uploads/files/47036943292.pdfIn PDF document text
    • http://rafaelokazakov.com/file/kamiguta.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/27933857098.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0a72bacec---30413012555.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/xinosixapotadiboma.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/xagulewojax.pdfIn PDF document text
    • http://anupbolivia.com/images/files/folerunote.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/tobelezew.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/pojoledurekenefasoxiv.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/gedizukolelazusuxabeba.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0698c8f1---51483947472.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0656b87053---loniwemanorokurawazuweki.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160704882bd844---nuridinizebuv.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833a63155b7---nirefikanedubime.pdfIn PDF document text
    • https://artbynela.com/uploads/file/50077095040.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/14913989633.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/05b93fc5e4207eb84e8b6fb0a38b845f/71517294017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=bw3+nutritional+information+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 19472 bytes
SHA-256: b740ed533e88669f8a735b45196b0a66d153bf494c9d6b6a670ce907d5a2779e
font_01_sfnt_off00013436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13436 17112 bytes
SHA-256: c3030c80e1e8e69cda3ebb2f98bd0a09ff2c9e9fd26ea41ecbfcfb180a48e8cb
font_02_sfnt_off00014cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000164df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164DF 10768 bytes
SHA-256: e37c53419f34ced8e73b3f208e7b95fa0e8fc2d2853fed67b752440fd3e32de7

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