Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0045a67a175449…

MALICIOUS

PDF

69.4 KB Created: 2021-09-23 23:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d0e0481a6922b18251703fc9250f2ce SHA-1: 536ddafefcfd9c1165da6a51083e8fe3c778ca42 SHA-256: 8a0045a67a175449c77b11ccfb3c34847cb82470b0655c8524a31baaf4d0bae3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://dejede.com/userfiles/file/bipokigudojatojagasuxalaw.pdf In PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/70043610651.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/zuserisegavup.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/govatazodasinev.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/67391491394.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/venukaxipujulapinafov.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/ziwixanomakorurerop.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/116e7dfc584ee0b51378a834545c7ee2/zibipejasedu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133711bca2f0---7308466788.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/67621670684.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/vejasixuxifexibokokalo.pdfIn PDF document text
    • http://npi-management.fr/ressource/site-image/files/29228175927.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613f65767284a---popiviliworigaz.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/xenofa.pdfIn PDF document text
    • https://fuoriscena.eu/file/bizesawimeri.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/fataxovuwegutezop.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/dabojabiziju.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f86ef8dca8---lafewovuxogoxugusinul.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/85508912790.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/41357719973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=letters+to+juliet+full+movie+123moviesPDF 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_off0000afea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEA 15292 bytes
SHA-256: e330003f6b6af5345b3d875ed165dea68f85af648880d47f450bf6d33c403bb9
font_01_sfnt_off0000d6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 10708 bytes
SHA-256: 70b2c59a75aad9cc0ab34688fc8f1fbcf8fc1106d5b3496a6c44735e2f566479