Malicious PDF — malware analysis report

Static analysis result for SHA-256 24659021ae2b4e4b…

MALICIOUS

PDF

78.5 KB Created: 2021-06-13 02:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 233fc632c5f98927da72a5464446daf2 SHA-1: ddfdd64389725bb6ce2c482d43145a19a00c6ff2 SHA-256: 24659021ae2b4e4b39c81b6e8de7babedc9a4d433d79579f776c234ae0bc1cd3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

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 https://smidgel.ru/uplcv?utm_term=ace+combat+7+t16000m
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/var20gi4t68o62a1sfmca20b56/87760146664.pdf
    • https://mariellatriolo.it/public/file/26724459704.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9471a8b14---11264801181.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7038548b84---zudedativid.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/um5f52vljj6vj2efmukcqu1aq7/jugumibi.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/junk14m8k4c8l7kpbrns8kmoh1/51455114818.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/xezubesuvevi.pdf
    • http://daiichilogistics.com/uploads/news_file/20308409387.pdf
    • http://ztkammer.at/uploads/file/78797950525.pdf
    • http://songiadahoaian.com/upload/ck/files/vigoxibofonetezega.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/03193a82125d60c170709a8dc7e62960/bofofimodexewodin.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/lur8b69r5iuda81s1banjdbks1/52623103488.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f687c25b13---9097424989.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e672.bin
e0f3fac8068dac60ecb179856adc03d2702da3e030483a742f79676863f95e25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 4832 bytes
font_01_sfnt_off0000f6e0.bin
896b8b11fcc7027420675c9b4d4ed74612a5988b8e41fe1f9019769a5acbcec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 11496 bytes
font_02_sfnt_off00011dcf.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCF 4324 bytes

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