Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a65cf5d48290ce…

MALICIOUS

PDF

88.6 KB Created: 2021-09-07 02:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dca47ad62cafa38c1d4774895b0872f9 SHA-1: 028724355f95dd555ec34c215c2899d26824b7e6 SHA-256: 61a65cf5d48290ce4299f1802f4eb7e41e2ff975f73d37c6c78a0bb7dbc5e416
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The document body is unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://gulceoyunlar.com/calisma2/files/uploads/nuzivagaruzaw.pdf In PDF document text
    • http://poledance-chrudim.cz/files/file/33367733821.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/85999322399.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/46818627823.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/25220638671.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/wimegapudozunamavadisifa.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/21efd3da3330f9e047c68cdf260ae768/20869030384.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/90241135113.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e217dd30274---nikowem.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/masefajafipisilemuteriko.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/zewekamapobanamavoperaris.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/wanasopesozuvubapip.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d358509f3ddca9451d446c0f2da161eb/soxopiguwoxekenetit.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/70632465804.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/61970434558.pdfIn PDF document text
    • http://miamiokclassof65.com/clients/d/db/dbefc63a503cf3d3a4f9fb61678ecc08/File/rununup.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/notonivixipe.pdfIn PDF document text
    • http://congtyvima.com/images/Download/pojobomuwixibel.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be43159c530---garudinefasutiwupebonukap.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/3b7590d2339d56b21ead103ba8f348a5/jovosokuwimoxelu.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/pcitvki19p0rkck09hme8t8911/gutirego.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/jurifolojuzuxuwaxaz.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610646b731c25---pimorogokebepujexamevebo.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/eaf15b3d2c1afd6aa884f4850bead7b5/15644733812.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/72746124686.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/pesewefotowanubetopamig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=le+bourgeois+gentilhomme+english+pdfPDF 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_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 10980 bytes
SHA-256: a635a46dbe93765877246095d0d3fabb2d712ebd7587f8bd27547b76e90adcda
font_01_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 21336 bytes
SHA-256: e5ab3e8117cec8d985194f16ab5f2dd150557c4fea67987f96a263daa1200945