Malicious PDF — malware analysis report

Static analysis result for SHA-256 122090cacae86d34…

MALICIOUS

PDF

80.1 KB Created: 2021-08-06 08:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 864d4d375ab0c68e2a8cacabd4367986 SHA-1: 25460e2d051d7062fd30b5ef0006d9b2c92df96d SHA-256: 122090cacae86d34096c9b757a5d28b484bd51bba6275de084a014d686b4fbe7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links pointing to potentially compromised websites, including one hosted on a known disposable domain and another on a compromised CMS upload storage. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of multiple external links suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/qtb0lnib7fck4vgdces2bi14ht/buxikifurabijoxugibabud.pdf
    • http://bagliodeimille.it/userfiles/files/setesatetifodovu.pdf
    • http://bartuceviri.com/userfiles/file/jarujawisotapikisuvat.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/962715695.pdf
    • http://bighost.vn/uploads/userfiles/file/84757800776.pdf
    • http://kahounova.cz/userfiles/file/kimawupanikepeb.pdf
    • http://palakkadtourism.in/ckfinder/userfiles/files/zemabitadoxepigop.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/butgv3f8do4aisep061433qr29/dekajorisotosebolaki.pdf
    • https://mysilo.com/upload/ckfinder/files/91313435973.pdf
    • http://joltiy.ru/uploads/files/ninikotejiwetozoser.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acef764d7b---pejuxilifozi.pdf
    • https://hanedantoptan.com/upload/files/mapudodabowaruvesonu.pdf
    • http://high-keenltd.com/userfiles/file/gasodixoz.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/kkc6r8sdvhuffcp6h4pm88npuk/sitabokemejevibokapox.pdf
    • https://rkdestate.com/userfiles/file/31590625028.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c204e1d0230---somalebubotelikatipofo.pdf
    • https://www.nevjegykiraly.hu/userfiles/files/lojowomuda.pdf
    • http://studiolegaletrotta.eu/userfiles/files/87069374159.pdf
    • https://lawyerupsmart.com/tempimg/file/49771965754.pdf
    • https://aulacvn.com/upload/fck/file/bategemozuron.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a95d3f2b18---68033555624.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/5a97c199361f7d137f0ab8a01d674e7f/webawobige.pdf
    • http://gyobel.it/public/file/ravones.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=9.s%C4%B1n%C4%B1f+denklem+ve+e%C5%9Fitsizlikler+konu+anlat%C4%B1m%C4%B1+hocalara+geldik
    • 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_off0000ce79.bin
35e7a50bbb033221bbe62e939dc612cf9294457b701832b52574b5b38c37d8c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE79 18460 bytes
font_01_sfnt_off0000fb94.bin
b2a26b4029421a4f071ec251c841f1ef3625f9a1dda239ce82e72885e1662c4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 11664 bytes
font_02_sfnt_off00011678.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11678 16792 bytes