Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cc4c007190de25…

MALICIOUS

PDF

72.7 KB Created: 2021-05-03 04:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73820bd5d5837116948c705d8e59911e SHA-1: 40392713b319a32f1c39ad449c284660ec1128bb SHA-256: b1cc4c007190de2599b57e284a56081fb9290fdafbeff6104d243a046f7dd4cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f75651ef2---lidojawenusixitu.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1e789b786---lijogexizo.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/899b59338b3b2b57ef7522f040048fa1/73136283392.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160813598e91c3---gebemoma.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/4d2654a83d4e4609949b85d06b9c6891/87664531908.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeb84cefcc---43670765652.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6fea1df10---46048272762.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756c979226a---97285295370.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3bdbaada8---5689280803.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/e9384b2430d7def5ec0ec744742c5011/gazugoxesibapavejof.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fe87e0e2b---66633878473.pdf
    • http://alliusie.com/userfiles/file/puredodabe.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608785f684e9a---nofofibabaredeved.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jiep3lf8inseooe4p2rmb6cij5/87516446053.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bf80ef64f---68497225964.pdf
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/i7k2dvnphr1m8t9f4glj2g7gca/36087647472.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/664c3c8c2df259cc17e32a00233c8c12/66356957541.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=spotify+songs+free+mobile
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df23.bin
af8919bcec3fc31e55cad42dda7273fbcce19630399f335246a697c2cc562425
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 5356 bytes
font_01_sfnt_off0000f152.bin
243a27d29bcc57370d448e1fe4353b360193bd72beb0a6ec55285d6c6fa1f40d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 10992 bytes