Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87cf75e914ddc95…

MALICIOUS

PDF

79.8 KB Created: 2021-06-27 02:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8350bef8e0253d69be9790463d819e7c SHA-1: 8c91e353a48b0f4529d7a47ed143e7ea18b20892 SHA-256: b87cf75e914ddc95231fdd84525541522f7603b93d3d5268b6b10da204a13faf
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The document contains numerous external URIs pointing to PDF files hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The primary attack pattern involves directing users to malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/8f1fdfe064d66d23bbe1f2fdb6912101/puxesajanomukiteguxi.pdf
    • http://littlepearlspublishing.in/data/eimages/file/kududunaxolamev.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887ff253e84---58520442006.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/plegl4h2mlpgs1qajr3nub835l/65428932286.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160786a7fa1191---kegefibebaderig.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6819b169d---sugakilibegukobalosa.pdf
    • http://lmyc.net/clients/875386/File/10329838533.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ac066702a---95795024370.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/f3hg6ovqe0edlrn3dkkdejspev/vepubonixapef.pdf
    • http://bhs-class1957.com/clients/35434/File/88943522192.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/v5o2vtq4k8qr50j6o0i21jabdv/fedijatatitisefowigu.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/g4sf1clbmukmgc8mnlo5o17mrr/doxevawowupifidututagapan.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3ktgef566i6lumlnludp9212o7/26563770501.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b9a388e9d---13155208778.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72a564b94---4696808207.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080922d320a3---76597773416.pdf
    • http://acpiindia.com/userfiles/file/xifetovime.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/5i3seaisuore53sh4usv3d5k5m/potudategojawelazazapifi.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6f2756b0---58792664423.pdf
    • http://luingpyrex.cz/foto/Image/file/momaxefolijeb.pdf
    • http://africareview.in/userfiles/file/lexaxukafimon.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/juvegeferutudubixovut.pdf
    • http://cphs1970.net/clients/877309/File/xekatapojolukalofitamud.pdf
    • https://twr1115.net/files/fckeditor/file/72740348334.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=you+might+as+well
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0A 16792 bytes
font_01_sfnt_off0000e421.bin
ef198936a0244c4b1f0937efa2c209ebaa81a88b7bcb07c19b064d1d2e4eeb26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 10520 bytes
font_02_sfnt_off0000fc25.bin
825d1a2b36a9c63525389d644a1a968ffb58d15521edfd8afa7e86b561e9bc2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 21884 bytes

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