Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07403a6ae55fda0…

MALICIOUS

PDF

100.3 KB Created: 2021-07-01 12:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c626689ca2c6dfac9558ed175c29758f SHA-1: 0e3d00cc279706c2761cbc8ddfc5cf9807a7b985 SHA-256: c07403a6ae55fda0d0f795dbc7820189706be017773922c13b8c13a2dc0f2db5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristics and URLs confirm a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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 http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e71eb99e973d023c9ef5ee8706c3716c/93615474718.pdf
    • http://school19-zav.ru/userfiles/file/remotufevurifoge.pdf
    • https://tortugafilms.ca/adminfiles/file/pimajakatopemavejuteler.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/77r9en21ng5hltg7bfc860mbvv/wejazarijowipovagolote.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/g1iva8134r2v4ng0ak2aeesb2o/pibokupusogugofi.pdf
    • http://xpressup.com/userfiles/file/buwozud.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/89220206351.pdf
    • https://travelstore.tn/userfiles/file/petelamuruwegizapo.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/08dqa926g2omb2s043vur8jvv7/dogigubali.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe7fc497a---68973728006.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7ec8e5fb7475f6873b21c02de2be87d5/17478971341.pdf
    • http://dulichgiahy.com/upload/file/vamedezamisunuripudot.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/uumhnn860c41lpnbpa1epuh3k4/zalalemefibuwometu.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986c0b13307---25960147736.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ad9c427dc338c91b6d6072083a097ea/xuditumerapabafale.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/d8f415ada02370174d0d5bb173e0ad07/84464866206.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f965322629---bilozufufalutefu.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af9c4862dd---jebazojibelileziwa.pdf
    • http://drivescuolaguida.it/userfiles/files/nizibijodigobewuxizojexe.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uhi2411a0olh466fiiakbjtrh0/25494573824.pdf
    • http://schokozentrale.de/idata/jiluxititavagusazenumiru.pdf
    • http://fotocaroli.it/userfiles/files/dipafikenuvasape.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7vspcbm330u86mn7n1cjhviaf/86982407224.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/af9baff2dab1f225db4b84ce86f3d36f/xomibopexujelo.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/de9065221c2f2fd50ce22e2f8cbb438a/nixosi.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d5049f9bb19c3240da6f324674a8937d/78682400729.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+make+timetable+on+excel
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bd0.bin
19c75029c303e9a086e8b5ada6d5be914df314f95e4eaaa09516d0fa5689ac86
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD0 17888 bytes
font_01_sfnt_off00013a62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A62 16792 bytes
font_02_sfnt_off00015273.bin
408033a9855c6867e971aceb5936ffb092ac0095e90faff4234ff28f61743f84
pdf-font-stream PDF embedded font (sfnt) at offset 0x15273 16672 bytes
font_03_sfnt_off000169c3.bin
75857f08b5b3b13f64837ce1c965658672057da0ec0f1683138d53cefe332933
pdf-font-stream PDF embedded font (sfnt) at offset 0x169C3 10536 bytes