Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2e46cd6a36b006…

MALICIOUS

PDF

71.5 KB Created: 2021-09-12 09:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ccec03882c1ce24d35e5b0e31ce75116 SHA-1: 576e8c31f32a26d82223a559a038540cad5a911e SHA-256: 8c2e46cd6a36b00689a744a768ffe43c38f65eaa4834dd7e13125ae3675324e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://alkoplast.rs/files/20982957781.pdf In PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/57446262443.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/zubodimi.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/77206356637.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/zatudutit.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/kizaxodezetiremar.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/fanudodivatolinalam.pdfIn PDF document text
    • https://italvaping.com/file/nimibo.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/vixinobu.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/92287366660.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/57283891716.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/20001639817.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613311f8e11fd---73946091535.pdfIn PDF document text
    • http://atomleasing.ru/media/File/91739442566.pdfIn PDF document text
    • http://mfahk.com/upload/files/todezufinok.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9577d4cba1186a03572ddfd6dc5b4920/letolevawefogogofupapoli.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/jowavapatudemamarovitos.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/46104625575.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/26591787524.pdfIn PDF document text
    • http://posuni.com/userfiles/file/baritejekomafumibif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336720a6c69---xelopazibom.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/magulowuwalovovakedafudob.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/rejuvigotufobapavut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pubg+mobile+chromePDF 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_off0000b970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB970 15740 bytes
SHA-256: ab4ba531af1cc20182315f15019265d71e6e039240eb789cceb4e511dc4e7d73
font_01_sfnt_off0000e162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 10388 bytes
SHA-256: 8e7a029eff9b58cf226d30f2fec2006092ef0b88584313c94bd2dfd93d480673
font_02_sfnt_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1