Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca3fd862f6a6fb9…

MALICIOUS

PDF

109.6 KB Created: 2021-09-05 07:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: fac849c8d18cbf56387133763dcdd06c SHA-1: e007577cb13e6bbd4111f275edde6c78c363b920 SHA-256: 9ca3fd862f6a6fb94c2060a4926558e98482d757832736421cb3f39875727a5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=oracle+database+11g+sql+fundamentals+1+volume+2+pdf PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2fefb61007b69b6a509b2db8af44c82d/nokajitejixuzogikibidiwo.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2b3b08526---76222669752.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/o9of5lkhfn0b989522de7lc230/pavufukupafaj.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084012518380---48515966726.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/vozelekuxizepawe.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be78c935745---tajonobigoto.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/betovagotewelobexifa.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/vopvgi2ua55lpndtvlgfl6esno/dexalubazuzomu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f429f9c0857---59154069456.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/subef.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cec4292df9b---vanutafexejelob.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e98d507453---82357440262.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/tawezodazapunubimibif.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/piteruwopavumibefeluweja.pdfIn PDF document text
    • https://chp-travel.ir/data/file/7409808682.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/vezutinuzojorisapija.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ad95b76616---47074739140.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afc99d82072---vofoxizewobawoxereweles.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/e18e3ecfad84da03d2059cbc9f159798/sifilaferekexijinejoveki.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a64e0bc977413607aa148ffd0d431b8a/69928938923.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/dubejobowededisizapiw.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/kozaxigegisedozorawosavev.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_off00014499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14499 18796 bytes
SHA-256: b65b397df48e55c0d4b2203053c406a40f3bba326941e225f9e46f3e53b73979
font_01_sfnt_off00017578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D8F 11520 bytes
SHA-256: 79b63eff832b86bf2f14f6af02e9040202dabf708dabee1019d0bcc51d2f1e53

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