Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fcc8c7d97b85fc…

MALICIOUS

PDF

90.3 KB Created: 2021-08-14 19:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 93d571c782adef78dca74376d7b111af SHA-1: 9f551bdeab8c4dba22d5082bd69d8286964f53b0 SHA-256: 87fcc8c7d97b85fc72325738ce59ab753daec92bb2e1dea1d1707fd760f4a961
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These sites, in turn, host further PDF files, suggesting a multi-stage distribution or phishing campaign. The presence of multiple links to compromised CMS upload directories indicates an attempt to leverage legitimate but compromised infrastructure for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/8d1d88e1ee488149195d854f412ecbb1/64331137116.pdf In PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16107bf71a8086---17953060609.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a05a14d7e19c6cee4313cbd4fd28bc44/nokeponogawebonibuku.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062409283848.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/6013417033.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dcee72af3---90052170860.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/jutinovobudalejirurom.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/26709517625.pdfIn PDF document text
    • http://aven.su/userfiles/file/38254843587.pdfIn PDF document text
    • http://starsunited.at/upload/files/82918225434.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/vapamavekixopedopawe.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d1c63602---finerodiginumum.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20218612213383.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/dahkrjjhgqifrmf7in0qunli91/44163895333.pdfIn PDF document text
    • https://eklyps.net/images/file/ximolotejujepe.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/damojewuxerudamu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/h1kdtu8153vngp78tbbakmls1h/81126881490.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/hfvn3rcvvkgth8empqelsdfnsl/21432409671.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/4801192798.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/dinidiluwogurutu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/53096731730.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/26484102808.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/xorodamogesefaremesuxik.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a02c2512bf3---68465536057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=suzuki+samurai+bike+user+manualPDF 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_off0000fe67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11679 16992 bytes
SHA-256: 5b261f8012c1c4c6cfae834c053ce43e77c7e3e5aadd375efd89d7b43b9dc5db
font_02_sfnt_off000142c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C5 10516 bytes
SHA-256: 8d43438891821ac5fdcbfc99b10c567b7458a793333880328ef81b2d90eabff1

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