Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a25c393c726535…

MALICIOUS

PDF

91.9 KB Created: 2021-07-14 00:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75bd2a1da7e674a2a54c5556baf5448a SHA-1: 93c8d44c18c59a6b1da396953dea176eade865df SHA-256: a7a25c393c72653596062773abbde0e8c8c4b4ea53c584ecef0ce4a371c3b472
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=gaelic+for+wise
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c859cf52a4b---tuwozeku.pdf
    • http://polish-house.com/uploades/fckeditorfile/dadafuvinisar.pdf
    • https://mertlakustika.cz/images/pages/file/fibeku.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/5b715baf9f7ddd2230142cfc547fdff0/42634041205.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bca8169a9a---kelepujes.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/8ie26cg4irghlra1mckh113d07/waxerajibitirusekuguxoma.pdf
    • http://bezpiecznamlodosc.org/files/file/40145597742.pdf
    • http://flygarfield.net/userfiles/file/78982670208.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd5dc2fe35---mipinebunogoxojiv.pdf
    • http://fresh-j.info/images/uploadedimages/file/parogitejedotad.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/5bs6vv634mr1qj4bj18227fb15/sixutipuzesubapuroxupid.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/putimuxudawugugalod.pdf
    • https://andrejc.si/files/file/xofojurudax.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d99776d04d---19778521071.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/08gccdckqi4nhtuaj57e4p5g44/nevovezekaloxijixuwolog.pdf
    • https://animaliadielisa.com/file/43653475391.pdf
    • http://alexdisinfestazioni.com/userfiles/files/wavalugota.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adc4aa56ee9---zakid.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/290548b1d4a3d8206f8cdaf2807a6687/fofapukofoteren.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2549304d24---vamezigogoxidevuremek.pdf
    • https://gamedunyasi.com/calisma2/files/uploads/39211435458.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9a8780fc474364be90714c395d944b6d/fipas.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8b646a0bac18e7ad364a482483ea4740/kilidowugijavasovepogijim.pdf
    • http://asbufestival.com/uploads/FCK_files/file/19483033350.pdf
    • 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_off0001019b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 16792 bytes
font_01_sfnt_off000119b2.bin
36e55faf739a24a95820e2d4684efe9d5a871755f34532343933265484070403
pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 10252 bytes
font_02_sfnt_off000130ec.bin
2a18f3be1b0672723ae4ec1eff027709b361bea46cad2974ef0b8bfd1294925a
pdf-font-stream PDF embedded font (sfnt) at offset 0x130EC 19040 bytes