Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd2839a328cbbc3…

MALICIOUS

PDF

86.3 KB Created: 2021-08-16 18:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d300261899be785dcaaebcae74c36fca SHA-1: ef4989a1f3563e2880f2bb676eb3a87381d52e32 SHA-256: 1fd2839a328cbbc3aacc1fcbcce1c7fdfb8af406f6832aa7272ba4a8b98ac47c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38023935656.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/2e3bcd624945cb88f8634c72b88fe8f6/mosivepedonususi.pdf
    • http://etasystem.net/userfiles/files/84563219855.pdf
    • http://bilafafafa.com/shopadmin/upload/files/75479472389.pdf
    • http://congtrinhnhaviet.vn/upload/files/87405476977.pdf
    • http://amdind.com/userfiles/file/97155917851.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caebfec0fb---ruledimosoxakol.pdf
    • http://applecentervn.com/uploads/image/files/nokowelajinob.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d043003e23---38311304672.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/da6e5b6d898959a7fa11eddddef11de5/wewiduw.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/bbc3d24a6768b2cce8f0fe2d0be48571/jizib.pdf
    • http://zbraneklapka.cz/ckfinder/userfiles/files/61567748449.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607039472a770---66932845705.pdf
    • http://maszyny.pl/userfiles/file/53413410862.pdf
    • https://crownprolaw.com/userfiles/Proj_Name//files/17555102617.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdfb7e8a97---radoxigexuzukiwalipigaral.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/nuvumibemufisi.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d13799961---83909497737.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608345fb792a5---gediwisexirowubevoz.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d83064b3e82d4d7da4de3eb9a0785962/12130946850.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/b5e1a3c7b4234fc2fe43b7769777f5b4/83795626319.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/60868f362767f108e09ffba06f2f20f7/newizopewibigoridotelak.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=best+bitcoin+mining+app+for+iphone
    • 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_off0000eb50.bin
3b8f91ab0012910ecfa5354544def1a74f0f361e803b6032c862c1ae2504ae5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 11076 bytes
font_01_sfnt_off000104c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 16792 bytes
font_02_sfnt_off00011cda.bin
e9c9bda428b7def5ccf9052cc40a567d44af9cf9f653b84c1677aed8fbdcbffa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 17624 bytes