Malicious PDF — malware analysis report

Static analysis result for SHA-256 005de8f7ac1416ab…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 08:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 04bd4181f52137c6972b03163fa0909a SHA-1: 1995c8ea75ef0a41d80edaf443810835d2d1a92e SHA-256: 005de8f7ac1416abf8282fa63c7e489f0881eff2a4c10baad0c04ae948ed5ec8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure suggests a malicious document intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://bluza-shop.ru/content/File/sebuz.pdf In PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b24f1456efb---39656461865.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/nomuturufomidejoxewofare.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e598e15f231---71815297468.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2bcc9f4bb---50500396078.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c530619837e---90816350597.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/9791594293.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/25196638489.pdfIn PDF document text
    • http://chinalabware.ru/d/files/gipatadu.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/f27f4a5e8d9cc9290adbd31b5090aa05/97627047431.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9eaef3a2691b79705d4639e39e277933/5226606528.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/10f09303c1befded2d14f045f302001c/vakirov.pdfIn PDF document text
    • https://ijp2.com/contents//files/fodelikefadabuvunitu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/3bfb8b1ad1cf99f274cf3dfeb310c740/pujus.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/e8u0pnps6gaig4oovh76vpu1a3/nizijofefoleso.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160757055c53d5---kupafitajujekawu.pdfIn PDF document text
    • https://le27.fr/docs/file/rimok.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/fexifenusaxafeperiwe.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/19737407044.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbeae61509---gugakuniti.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/66909325960.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/karoguxukapaxenusam.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f94e68da---virefadabixobibukiwu.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160853f85a0647---25149098703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=psalm+98+commentaryPDF link annotation
    • 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_off0000dc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1E 10792 bytes
SHA-256: ab1c2dd46012f2016908b4d9d79bafa2070e1d0d7c23293c1897b89ab3dc08ff
font_01_sfnt_off0000f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 17540 bytes
SHA-256: ef57c4a890ad46166d8094f8132ccdec1250334c382f5b397942ba462ffdfbcf