Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0951b87b41587a…

MALICIOUS

PDF

129.3 KB Created: 2021-06-25 16:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9041ce38c4818fd04efcb43b8b8fefda SHA-1: e858875e3820c696a8d28729a104fe332fb0fe4a SHA-256: 2f0951b87b41587ad30f9fd7378611d8ea52d3c6b9ba96fa43dcec0b593be09f
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to various domains, including those hosted on compromised WordPress sites. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://crewmak.ru/uplcv?utm_term=history+of+rehabilitation+in+prisons PDF link annotation
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/30988677861.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1a217c99d---94198202534.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/5e29e7ad6722181a8d378aaa6de0ca25/96323479804.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0ae685cd1---miwoves.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/povulorowusogilemot.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/gujaremejeworoguz.pdfIn PDF document text
    • https://dm288.com/slicice/file/jutemup.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/xerebajo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/sawotizumite.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a317476d---binodokusux.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/woliriwepiz.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/858f1f3b4a3613560ba3a1a0436b975a/jusibe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608455c5193a7---bidamenubonewiv.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-3/20210503110611110997.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160861dcee8628---99572884340.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/8342v91tg8r7vtdmmf37igdn9c/72984826502.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000191a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191A8 1636 bytes
SHA-256: e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500
font_01_sfnt_off00019975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19975 16924 bytes
SHA-256: c58b827f6dc466d7477bcf43fe651de51fbba878362c23d1ac17589b923ff8c0
font_02_sfnt_off0001c5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5A6 10700 bytes
SHA-256: a2d09b9ddc454618e1ed3c7be76c44092e85ec55d465fe958d242c2be5469039
font_03_sfnt_off0001dde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1