Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a86a198765372e4…

MALICIOUS

PDF

97.2 KB Created: 2021-06-26 03:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b5f43167ab1a4fb6429809359205fd29 SHA-1: 2667cb861f876e3b0fa5a12c6728791ea4bad263 SHA-256: 8a86a198765372e4e55f0074175193e8132f22ffc0c362f25cf2fdbd82bb323c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files hosted on various domains, many of which appear to be disposable or compromised. Heuristics indicate this is a link farm, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/c2554c91c0c58fc60b4ecc7d4857b8c2/wezofazepavezolenux.pdf In PDF document text
    • http://aire-limpio.com/img/editor/file/penokeve.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/vefanofatotarukerifadi.pdfIn PDF document text
    • http://funperm.ru/content/file/ledeganozufa.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/16771827189.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/pozerarigaxila.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/46671312512.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608579ff51524---59907863629.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bce3b63c5---59887876678.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9144ac20d68d10bf999c6cdf601a4839/43728215459.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/58463658746.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8d9ca29c8f731c0f5d5f864cfb234afb/94954572235.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095c6aacd2f1---soxaponumobumiris.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/da7ac16d4218c5f83c7d0a096cd1f0d8/jitezubazo.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/55384178611.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/rha0o925s3qtars1s9tt78ep8m/powixarafixuzudapejap.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/12a815grh8aptivlircburd36u/muvujijivipele.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767094a3d09---19938110702.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/5846999969.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/jiduranatamene.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wewaxefefirelemobagoz.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a77cfb1df1af3914b996dbd7e06d6ef/retizufot.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1beace00c6---zopafewanevit.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/6do6mblee0keo5apkbf56uoeed/14495029281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tenses+questions+with+answersPDF 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_off000115a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB9 10452 bytes
SHA-256: ff86f90d79b6af4b04e7e2cd7856a1d5e56ee9bfc931dd806b0dbd24a11151d1
font_02_sfnt_off00014581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14581 19332 bytes
SHA-256: 71c56f57b9afa70813d6b5dcdab977ca7247ad3dc82fc7f86193e7ef3580d809