Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7295b8f1ec3ce2c…

MALICIOUS

PDF

93.1 KB Created: 2021-08-26 11:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1dfd15b0f34110636ab9c8396ab9322 SHA-1: 2427a467b0758d3af3ed37cb0a27384710825f79 SHA-256: e7295b8f1ec3ce2cd46f4275bb6e85e174caf368cfefc494669866b9fec184d5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites hosting other PDFs. Heuristics indicate this is a link farm on disposable hosting, designed to redirect users. ClamAV and an ML classifier also flagged this file as malicious, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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 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://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/h06bqfe9ntgonr6rpjcgl979ag/19420863218.pdf In PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/f3b8b7b4187ca5dcf3af3db96462721c/boxafimarekupezowek.pdfIn PDF document text
    • http://skyparadisecoffin.com/images/media/files/63402626354.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160891d821d637---47537378283.pdfIn PDF document text
    • https://ocw.tw/uploads/files/65346658286.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/vumugupokofubunipux.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cd9f88392---lexepuvagogiji.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/retopokogabexa.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611df6e938b5e---9536062998.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607775cd0fdcc---41615148722.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/tefiridajup.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/kazelotozajazutimugi.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/635c805ec2fa185db95100f54edaa889/tigixatedaxuto.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e491be15d88---12115751193.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/36408697438.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dbed432e4e0---wogumeno.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8e460b17d95fe25bddae0a8002d9e20a/20723195955.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16117887219548---56997032368.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b95b2c2b6d5662c8bbfa4f3f1e8b14c0/marugakevovosisav.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naxetozawekawirisazu.pdfIn PDF document text
    • http://schokofontaenen.de/idata/69121963433.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/boxurexomujekenanet.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/waseduxener.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=arc+length+examples+with+solutionsPDF 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_off00010476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 11092 bytes
SHA-256: ba734d0bfb10a15f357aa780ca7ebdf29bb9415249aa6c08925e695942db2748
font_01_sfnt_off00011e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001364d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364D 18212 bytes
SHA-256: fcddee5cd2e1f62b80c22547eb884fec9aa9b861eee4cc246b8de6faabce1092