Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d93ee8844ff2ce9…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 09:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26a737f5c241c52bbe6c664e4158525c SHA-1: 00b47974d91b4465111321936a0a2cb6c07f8c7f SHA-256: 9d93ee8844ff2ce945b99496eb6844d13b5d798c1c933bf48637a21a26432578
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 CMS upload storage or are structured as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://krisoc.ru/uplcv?utm_term=phone+themes+for+android PDF link annotation
    • https://tradingcall.in/ckfinder/userfiles/files/69668376481.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/12853846131.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613408cdee5bd---2281694267.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/jejizoxozimi.pdfIn PDF document text
    • https://melz-feu.ru/upload/tawiv.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/52764231266.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/52007652096.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/515469309ffae19af092c8c2a31a1cae/18864457042.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/jijonobozuli.pdfIn PDF document text
    • http://glassick.com/userfiles/file/14357447835.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ljk5dvirijkm7re066var30eln/fabopevo.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/nusuvitidubafewasulirol.pdfIn PDF document text
    • http://thecuriosityshot.com/sexeduduse.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/wujaxixit.pdfIn PDF document text
    • http://dsraxys.com/uploads/vaguwokidumukof.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/pivof.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/60694278117.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29506127790.pdfIn PDF document text
    • http://haphadoor.com/upload/files/mejiribisubetelirepinos.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/5755046860.pdfIn PDF document text
    • https://oferta.lt/i/File/76861264484.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/metonidaf.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_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 10572 bytes
SHA-256: 22de00456f26cfe903ab4c883946b9943ee0cf1388689a1eee6bc86e389226dd
font_01_sfnt_off00010250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 18228 bytes
SHA-256: f4cbeb3e16ff2c09bb1e4c345869aaf192149ffdf0621394710a78fe1eae4ecc
font_02_sfnt_off00013223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1