Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc7357f2c0ddb06e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-05 21:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79f38e4cb90a58c377a4bdb7152fec36 SHA-1: d698452e0602f7b3dca95415aa2b617a0e8efa3b SHA-256: cc7357f2c0ddb06e8e19517cb25045c78cc3481d147f3759a328a8039eeb2bf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://nomylo.ru/uplcv?utm_term=2015+gmc+terrain+denali+infotainment+manual PDF link annotation
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871ac2b5300---23515776431.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f05a72c7510---zitazidazu.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/61480191044.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/luwelow.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/sisoduselopujisipifekezad.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/52172838282.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/molalaxajuvejifiraman.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/0cm2q63l4qdmcesrgd270smdlk/65654379051.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/figatevejenixeva.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1277c1470---kemepeseputebupuponel.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7ac9a7efa443f532cdc516f75e6855dd/tejet.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/5379067276.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edc4e9f037---xarebapilufitulo.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/kirevixokefufevozakezuro.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/bde4c811d9c2bb652814804dbc75bfd5/56356210540.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/oeh7lqmhdheqde2ip0os90nmv3/puluda.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/pigepoxosobizubuwupoxi.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/586f8d18417dd00d335ea85b8ae481f1/57629449646.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/4341310356.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/51682757128.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/b9d57545fad1693b0b483ea9755adbe4/18287085386.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b03afcf45d---vafusirelafexazonerigirod.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1132e8bc2a2b2cb2ce7861ed822ee45c/bejisepezorutigunorigo.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/bodazifedefusoxukoluf.pdfIn PDF document text
    • https://arerp.kr/data/file///48423623263.pdfIn PDF document text
    • https://ocw.tw/uploads/files/34838322111.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB412 14888 bytes
SHA-256: 3d812d87e52a043892d88c23ffbf55d9161e21540415b1664234b3a169834013
font_01_sfnt_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 11084 bytes
SHA-256: 48a46eb9320856a04ccb266ff3950ba8bd94430dea9b1c7371c69efcf0c687ed

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