Malicious PDF — malware analysis report

Static analysis result for SHA-256 731ddbf6a4321049…

MALICIOUS

PDF

79.0 KB Created: 2021-06-24 07:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 02a8f311fd943fdbc9fcd1442e1dfaa1 SHA-1: daf23803f72789f5e5ee2c083708bb5d67aa3870 SHA-256: 731ddbf6a43210498261276ec932e10cda5fda82b2c174a542e25e271372d944
164 Risk Score

Malware Insights

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

The PDF file contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure for a marriage biodata file, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/bcl4o0if7amenre2didd831o8k/xokumovamubexutitosu.pdf In PDF document text
    • http://activesolutionelectric.com/images/file/sedofakoga.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/79642370389.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/fumiwi.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/2802227958.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/ribevutisuwe.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/3p8fbvgdf755ik6ks89b3lmq88/58145439283.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609846153f363---tifosifuwi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6522a90087---xukelulonupisunu.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/r9brnnrs65ilfc9dn47e8i5d8v/21065932568.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/giwabawosirewodomoberita.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ililvlr6m9m6ngj2u4e4hd9qmo/78392441784.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/raod6n81hs41etvq7ba95rkkeh/37190308113.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/wivaxudagabamug.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/27e7fb46d435ae3a7bee6c2018ca800c/41839337341.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/av4hlmnigdkah9iohlji91dair/fuxajag.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33347242aa---61870526262.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/42937888348.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=marathi+biodata+for+marriage+word+filePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 5380 bytes
SHA-256: d9f5feb4301f0c51e30f23b797b30c703b2124f96969490c4577c6450c8f7969
font_01_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 10704 bytes
SHA-256: f17a728e67b1814a1b520692f95911eee2b4e829b57d104fe426a567bb7a12ee
font_02_sfnt_off000113a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A0 6832 bytes
SHA-256: 1c0f69c3a2af813a9db1ea9fc14e70d807ab66dab06147ea5b8555c0a70d4774

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