Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b842e20c945c2c…

MALICIOUS

PDF

94.0 KB Created: 2021-06-30 20:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdfd16888a7223f14298ee00d9e23e76 SHA-1: 93b7dff4f2232094f647d7e463883e0b2813a3c1 SHA-256: 01b842e20c945c2c3ce59f9e4b05fe7db4518253c62084a1c656b1d2785a5a24
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=web+and+flow
    • http://ubest.ru/images/file/nisogowenajosovonox.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/c4c36c797e1dc71466d04ae5e9bc0271/jukekizu.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/58uvd0gfrh6e2fb7kjvt426icp/javegi.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/4927bab2904d931640d7e0b8d7add30c/fibalara.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/0a20fe98df8092d8e75206b60a8f3221/8511654778.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11c7be8483---17455377245.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/2ja3vgvick1e00dffanua364pu/menusubidulaxumegowiforu.pdf
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/rudekafigasega.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/8q6mlfffrgs9n5ihdffghlnltj/40714046612.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/90038b6791e0208a3f14cc2dde349898/moraxuzuravaduzerodugir.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/pomenixen.pdf
    • http://biotop-zamosc.pl/userfiles/file/4126162374.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a10e6782548363908acc5e2bc56ec4aa/60882384637.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a7119da81---sewejeg.pdf
    • http://vivalepurrexotics.com/clients/2/2f/2f65fe2011b8f0b07f64c29a74835a02/File/kitoloputozakuva.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/9d1233d90f54605cfd4cc4fb71c30a84/depikuxasivuremapigigena.pdf
    • http://proxima-design.cz/files/file/91929332670.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/11e5b408953ce69c2379caeb2236e4b4/xalupitituke.pdf
    • https://syntellect.ru/Repository/file/70969100257.pdf
    • http://abc-tel.ru/data/File/75098166984.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac278d6ae89---begajaketutubizajaje.pdf
    • https://mvpartners.be/images/uploadedimages/file/wutaj.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c321315b1e---30470052321.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_off00010a28.bin
f79826eed6447d47da948c8f792d69447e6315d197be4911f010c33e2daf0978
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 10108 bytes
font_01_sfnt_off000120e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120E3 16792 bytes
font_02_sfnt_off000138f5.bin
33dc4e96fa066f528698b99849ee3f3426c15a49fbcf8867965de1fd0a7966ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x138F5 18596 bytes