Malicious PDF — malware analysis report

Static analysis result for SHA-256 082086e0be885d3f…

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 23:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b25cc46b73056e9786595979da948b40 SHA-1: b5302a64f4f5bf26fcb2f2b0df97a939e5900cb3 SHA-256: 082086e0be885d3f95ea43d76969c65c7c2ebbf4ab84626f3b838fa08e10bb31
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ca78apg9krogrhnrmnq6nmfttj/33369194003.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/63e66330bc81b6e12b1f6eb52d7e0c2a/5266947592.pdf
    • http://drthchowdary.net/userfiles/file/kojudebiweme.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f237ae17461ce700e2bc0b3f173021b5/bimilakepovozuv.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/32052151080b49d962fe34416401e10a/jurujiropasitoxaxi.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/06f570803b54efacf803bb545c67edd6/38098111871.pdf
    • http://pamat.ro/UserFiles/file/71701402088.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacf17ac61f---nafoforosujegutonerudo.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160705c485290f---11558470084.pdf
    • http://diacritic.org/travel/app/webroot/img/files/18060270245.pdf
    • http://davidhammerstein.org/userfiles/file/5386862918.pdf
    • http://www.hangmandigital.com/files/file/38389111807.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/54mrbdb7oboksgih8id324fod2/jedufojagu.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/018efb13b647d0acd631b5a759a77371/18849332543.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d440b67391---jovuwetojaxedabijodukati.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836b42976e7---15717922229.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/f8972797896d23dff186af358f3688ed/28755434473.pdf
    • http://ecohost.ru/pics/images/file/xogosodirunosinixixego.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22c84ef9aa---lesebuwofov.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b14d0657a---zibuvagaxitowozivijutof.pdf
    • http://gourmethousemacau.com/UploadFilesfile///xotofekupiximutesiwenidaj.pdf
    • http://nieruchomosci-swidnica.pl/userfiles/file/wegezidufipixirexojixar.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/je758oruv56ialj2frafammg9g/gagivisunobejur.pdf
    • http://asupuro.com/user_data/image//file/44138985794.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=colchicine+and+nsaids+together
    • 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_off0000ea1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1A 16792 bytes
font_01_sfnt_off00010231.bin
6ce8adbfaf05df4f572ea60a5d4f125d59576d99e1823fc4854b5544034d8102
pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 10680 bytes
font_02_sfnt_off00011a62.bin
61298c81897ad4b7fa8d9db8a874eb9a9482fd04b133858bf90051a191b48fa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A62 19804 bytes