Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba76c3ed87c5b0a…

MALICIOUS

PDF

84.1 KB Created: 2021-10-07 14:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6bbb2a1ee60c89b03809fe4fb83748b7 SHA-1: 6b5c15bd2a73d5a15405c57d5305f6e73409daa1 SHA-256: cba76c3ed87c5b0a083fef6e4ac251b822dd3bde413321e24ae11c365eecf0f2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://jiji.pgo.tw/pic/uploads/files/vunazuzel.pdf In PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/fafuporofugajuneripedut.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/79384854308.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/46699315974.pdfIn PDF document text
    • http://fkhd.cz/data/img/vulubuwulikuwiv.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/ziwofedegafesurofa.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/45530684052.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/36023797738.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qm7lic6peab3n9f1abt0n89872/diwoxalejejiziwovezunigej.pdfIn PDF document text
    • http://eichler-kammerer.de/44950147542.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///nevujemirug.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/276624974.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/felikifixuparoluditivop.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/cc631c7e6c226abcfdc6bddd53ad687d/gipisugamexegobujipunodo.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/nemopexowujowuruvifubu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8r59bmglh5482harag3f2im0p0/92632462479.pdfIn PDF document text
    • http://bulgariapools.com/contents/files/vitelanafazoje.pdfIn PDF document text
    • http://wdnederland.nl/file/litevasigogomupanikuseke.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/tuvegiwilagerewow.pdfIn PDF document text
    • https://deloge-nt.fr/media/photo/file/wopuzosip.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///vugezugamodonatavalivot.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/068d66b0f3b38c8d6cde13e737e48be4/jekaxuzeferuxezepiro.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/17558847702.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/60587227199.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/21961a2d4239b60ba8427dfa52a02a03/69644552644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+build+a+woodland+mansion+in+minecraftPDF 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_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 10952 bytes
SHA-256: 3c26aa83d0343b518f7184c6887f09e5f9e049980b845dc1ce110555b586dd94
font_02_sfnt_off00010fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 19540 bytes
SHA-256: b76a1d83032cd0478e351d9797abbaa1d294c6866abea951a4462f45d0c0177a