Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e615b92422476e…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 19:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3db567ca61e51af2038a69d3c943446 SHA-1: 6ff4bec96c84e25b37662028e5a3d3c72b706407 SHA-256: c2e615b92422476ea73ea3b2bda8d87b45fe15ae371528d6337fb2fd6ff96d2f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=structured+network+cabling+standards+pdf
    • https://psfund.org/public/uploads/files/cms_files/fokobej.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c614a2b166b---tapivitutinipusapupukes.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942c59b5148---4791399261.pdf
    • http://greenglobepms.com/uploads/kasukexowetutevo.pdf
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/dewenebewarodipifozub.pdf
    • http://veterinariacasettamattei.it/userfiles/files/96547776266.pdf
    • http://mini-garden.ru/userfiles/file/tolag.pdf
    • https://anhhuynoithat.com/asset/files/zufaburajasozo.pdf
    • https://burgas-remonti.com/userfiles/file/38692184239.pdf
    • http://moodyhighclassof70reunion.com/clients/2/24/24f6aee67edc386a60746049a176a33b/File/gupejotuz.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8c2d3d402---39184771467.pdf
    • https://steammining.com/userfiles/file/75429603261.pdf
    • http://ngnjl.com/userfiles/files/goxiko.pdf
    • https://xyoaa.org/sites/default/files/files/vawirodozoxoledilebis.pdf
    • http://cy2hand.com/userfiles/55648972927.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/48d7gap3qm8ub37nchbec4ig68/tekizivunojegezipif.pdf
    • https://apotekatia.ba/fajlovi/38100744241.pdf
    • https://people11people.com/uploads/File/71943141094.pdf
    • https://giritrademark.com/content_files/files/14430992162.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0207151dd---26749029369.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/c0b17ec6b939877adc86c1a15b7cf6f3/22086142934.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5b22b816f---xikigavegivijetarufuwi.pdf
    • http://lucann.com/Upload/file/bugakokogomimirorimafak.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/aea4d5fkqe68pdhvghuf97rfe0/nesexolufejuranabasive.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e9afe75d7---zutuwijuruguledigajole.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_off0000cdb9.bin
6b4aa05c93d187535c077cc6436ea68dec81d57b26dda67051e59f38f9a85d96
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB9 16472 bytes
font_01_sfnt_off0000f81f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 16792 bytes
font_02_sfnt_off00011036.bin
37748743eb3a238c4911092d9fea813ab3c108abf48ca819ca0eb7e4acb5267e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11036 11288 bytes