Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b73c9f9ec9c6bb…

MALICIOUS

PDF

94.8 KB Created: 2021-08-17 02:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 50e3d3808809ca5c7d10c082d2fd9c69 SHA-1: fa22fa10fc47b876ede106c11b81de59cb78ab85 SHA-256: 36b73c9f9ec9c6bb2e56cdb35babae295e04ed33647be47732df7dd3ed01e23d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress installations or disposable domains. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery. No scripts were extracted from this sample, but the structure and URL distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=what+is+the+main+theme+in+the+wife%27s+lament PDF link annotation
    • http://anhuizpyy.com/upload_fck/file/2021-8-5/20210805192057132997.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/683182fd1c4f7dd254d15747a34d9026/24534693947.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/bd0c6c5df9306fd1a946c969d21d58b0/mubirakarelozatinuginap.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/69844086921.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/68129958796.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/gimifajavopewaruxeb.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/94184076853.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16208296351786578879.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160942d41bda04---bowulirofidenusimurenil.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/zuroxijerewujoxumifadiwi.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/55229752779.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/52463139561.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/0196107b3cd8daa1efadfd8a80f2aaf0/24056637522.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/21244922384.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/sogotuboju.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5gd688e757b954md9glnol58d6/fipewi.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/7f271fda2d210ab105eaf29f56f4d9f9/vakepepububetimitax.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a433d181c7---gajazuwezadala.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/40685317258.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/655rv9l819h2oh297676fjgeqv/12003296187.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/25532327511.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/92a27c9db9423e2a38c7e92821805796/pazosaxopu.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/gapekuz.pdfIn PDF document text
    • 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_off00010f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0B 18032 bytes
SHA-256: 0ceaadbfee2fec3c679570dcc5f9ebd1a11d51b40dfb05038c55d73a523aef72
font_01_sfnt_off00013db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB0 10372 bytes
SHA-256: cfa464322513a07030bf048fa126ea3d5d4c5e690020b1cceca7a3b557623eab
font_02_sfnt_off00015509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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