Malicious PDF — malware analysis report

Static analysis result for SHA-256 88688e77036b78fc…

MALICIOUS

PDF

71.7 KB Created: 2021-09-03 15:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d9354faa5190ac4e97bd3a8b77bc7151 SHA-1: 6ad652eecca192b7b3621dcb735822139ca8a337 SHA-256: 88688e77036b78fc8c553df9149ca730a228f544f13f9cd3d000e1480b8987dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088899dd748c---82776378206.pdf In PDF document text
    • http://3dprofi.net/images/uploads/file/bitok.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/kepovikelagomoj.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/70574386153.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/oe5riu7mv2sb2qk3j81ov0nud1/bonudorigabedetulekojotig.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210622_F2A50CBE6E0B74A1.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/2577801038.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/92881867668.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/5l16teah3egfr8edi7v4gficu3/tuvozoka.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612b88be1b5d3---xejoxefogiwim.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/gupaxexajelew.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/gimalisabafekivokakivu.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/65722818704.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8e244f3ba---wexaxarovotunolixido.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/63338254820.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/eprggvt6o8odhpsgn7vm5sqese/bimikogijaforamimegexota.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/bedinilajo.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/46588347087.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/xerafarujiworonanijin.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/91985840473.pdfIn PDF document text
    • http://vitrine-prof.com/files/21770507673.pdfIn PDF document text
    • http://poorclarescork.ie/images/sewawoxametenagefonav.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/11287899232.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/46952136138.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9866ab5cad397c65580c022b119ee7d6/48470001239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hoodwinked+movie+worksheetPDF 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_off0000b77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77A 10540 bytes
SHA-256: 69b487245077623c5d664b4b28d9ecc655fb472ed05f215eef49fd5bd2e2cfeb
font_01_sfnt_off0000cf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF48 16144 bytes
SHA-256: 73202537dd7b9bb321951d9b5d6f57015b25eb42e4a2317cd6b0c1770f4a568c
font_02_sfnt_off0000f8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1