Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8adefe5db1a24fb…

MALICIOUS

PDF

94.9 KB Created: 2021-06-27 05:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20f20105b82fb29c284b7f5a40bc8d9f SHA-1: 83954137955a335b2a506a11bebc28201acd0cd6 SHA-256: f8adefe5db1a24fb55fac0821706b8c026a62eb583fb437df23138e5fe15cd4a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nnkcreations.com/userfiles/file/57770886828.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965f5f622e1---bibepegodejoteno.pdf
    • http://cityfate.com/files/files/pagupifonifekorunof.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607797038b4bc---23161979923.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbc645007b---68445513826.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/e4bcc9bdcbcefd3b14c65fe1e8560d06/rexegapizukirefibedamufom.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/2b1861541fc66e3e850c97e6e0100459/36008529006.pdf
    • http://casaalu.com/luutru/files/dukewe.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/76663984614.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077108dd71e8---lapawore.pdf
    • https://viboot.com/ckfinder/userfiles/files/mejuladaveparoxiworab.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f24985b9d7---neporotowifavafijej.pdf
    • http://nowyhotelik.pl/userfiles/file/vimolilidasituro.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c215dfead6a---63876789042.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/vq8plkpdbev9juhqtvtqt1euo5/50636762423.pdf
    • https://securitydm.com/slicice/file/zubafam.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bf17a32da---77380501018.pdf
    • https://asiabiru.com/contents//files/80585307926.pdf
    • http://vangphugia.com/userfiles/file/3844378995.pdf
    • http://htwy.com/upload/file/71628344231.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=manual+for+craftsman+snowblower
    • 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_off00010f6a.bin
15a55f465b998b81e5fb48f8ba67dd6f4a0e1b2c1314c4035308867c7c637198
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 17484 bytes
font_01_sfnt_off00013da2.bin
da7ebe6b86986351882e76c1b483c0ebc6dd4f2df5f4255743595c417cf445a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA2 10724 bytes
font_02_sfnt_off00015666.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15666 16792 bytes