Malicious PDF — malware analysis report

Static analysis result for SHA-256 531d054372ec6f9c…

MALICIOUS

PDF

108.9 KB Created: 2021-06-28 15:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d9896e6645f72518cbeb8db981dde02 SHA-1: 00251e4be0068df7636da77aa5270fd297a9d20f SHA-256: 531d054372ec6f9cb218517640342976b87d91ebf56ff740e4629b76bed9c58f
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of link farms on disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b53162e76e---xovonilananuna.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/44a5d25ad25fa25cd9c2e1f167082774/godebo.pdf
    • http://bielwod.com/userfiles/file/48849538203.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a288d4211fa---87520171177.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/83a15c4573ed1c95c944f3f7a7fafb9f/32025867484.pdf
    • https://iringmalaysia.com/ckfinder/userfiles/files/69252368601.pdf
    • http://cafegreenwichvillage.com/uploads/files/26718640860.pdf
    • http://lycee-elm.org/userfiles/file/xakelewazavekokegiki.pdf
    • https://mimpishio1bet.net/contents//files/kunobezusafijaw.pdf
    • https://ahreco.com/uploads/news_file/bipad.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609e604a29230---92835673669.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6d6e141a87044cbd629e4194091e9444/nafororogonizi.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d165cee333---68125434614.pdf
    • http://www.moyekolodin.com/files/54140555386.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160772c20d9091---kabelevugaripopekelo.pdf
    • http://ibconsulting.it/userfiles/files/kizol.pdf
    • http://b-solutions.net/userfiles/file/tonutedirelakama.pdf
    • https://ludbaegitim.com/calisma2/files/uploads/sakato.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/23066802027.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160833ca75bfac---wufukobofujudiwej.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f21675bb4f5152e1f85d5f0452922fc8/gexumivajet.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a385139d790---80437791795.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/i543vmi2lldo1mtg3vnficajvu/pavoripaxamipajiwe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=topping+apple+trees
    • 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_off00014779.bin
fe008509db3e11eb1c5675542ff951bc46e37ce15249ad32e653298c4f66499a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14779 10392 bytes
font_01_sfnt_off00015f21.bin
11fe920b20a51e470198ad3887656535c95abcddd537d2ac90506cc91320784e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F21 17452 bytes
font_02_sfnt_off00018ced.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18CED 16792 bytes