Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f285f66f63f134…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 20:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8112932fbfa8b34a84d677db71b3315a SHA-1: e0991263f46e21c18bd650485393d7f651f528fd SHA-256: 05f285f66f63f1340113b5bd66437cbe54ed75cd07dbb9aec386069a3f55c526
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://catamma.ru/uplcv?utm_term=aladdin+full+movie+malay+sub PDF link annotation
    • http://suphammamnon.org/uploads/files/11280979442.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/10417452946.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/3b2e4a65542eabb007e2fa88b5ec86a7/68884870481.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/livaxazip.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ti0pkvn02cvht5n8k9te96mmd3/vitakutusafire.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/33719899695.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/wekagedukevapavebad.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/kulop.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/32356256917.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/77251779940.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/66105940613.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/70602267515.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/xetagos.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/jedefup.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/17897836718.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/90475044002.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/70544464498.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/keranedotosit.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/94542206596.pdfPDF link annotation
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614003b57e823---suxakapagidoriwuvaz.pdfIn PDF document text
    • https://bfull.ru/uploads/files/66525131191.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/karaxuz.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/67579517725.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614024eadcab8---wadigojudug.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91540835859.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_off0000cf52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF52 17160 bytes
SHA-256: 300ee800e049d15aac0dab13036f4526329f06b55d2ba08556e2f328aa541759
font_01_sfnt_off0000fc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC54 10716 bytes
SHA-256: ba1174cfe43567832e0f65713ca6947323b39b51a5447d851e7a4cd2c5f644bf
font_02_sfnt_off000114ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1