Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b976ba2b84d081…

MALICIOUS

PDF

90.1 KB Created: 2021-08-11 07:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c57e2b36a0e641a9c107b7734e7b62c SHA-1: f503168e6c259e2adc064782cd08d9a1af4acd17 SHA-256: 93b976ba2b84d0819a711710806efe06bdfdbcc618b25f421f4b1d01ef6669c1
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple high-severity heuristics, including a payment redirection lure and ClamAV detection as a phishing trojan. The document contains numerous links to external PDFs hosted on compromised WordPress sites and disposable domains, suggesting it is part of a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 http://alexandraharris.com/clients/36054/File/79171365261.pdf In PDF document text
    • http://yonseri.org/userfiles/files/62679617146.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c48396b825---wagupukinanun.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c5b6168f---29785799204.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/54c4393cc0bb55af4d5b30b1765c0000/mejiwuguxedumewutejelawoj.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b711c474ac---nupemavexurizonexepajimiz.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/40566046539.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/58107570096.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/pabovikitib.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/1bcf277fb9bc329abdd2ad5f96ce398a/sujawamutidavu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d9e2c63a2---61466840573.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160771568a4af1---gudedeb.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160901063d2770---57725299886.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e6a72fc86---gupolixul.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b4289b4d615---69212161324.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f74a1a59d---vegutusewixateroni.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/45419895316.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/a539b43006af3cdc7b636744e6fb2e20/693591497.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/14oa0onhtaki8grshnodh4ar85/1045999585.pdfIn PDF document text
    • https://506hlapeta.com/files/file/16329950613.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/63106826462.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc65845c3---menofo.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/29e79cd6fb38c40974140b4f08470e19/ratisalokoxutumil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=are+1979+dollar+coins+worth+anythingPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F31 18336 bytes
SHA-256: aad4abfac91fcbb0ec3c075251a7fcbbfab78093d3f660c81d94c9a44d0b5dab
font_02_sfnt_off00013e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E91 11100 bytes
SHA-256: 771e1c1ed90290055141d5289e59725729a27fb596c7a63edcb0f81a2cc7377e

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