Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb9ee0f24b39d40…

MALICIOUS

PDF

90.5 KB Created: 2021-07-31 00:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6803f18ac07c8ebbd73bf5626d2a616d SHA-1: c04b2b09e74f2b37f6c104db0bae22b3478dd2a7 SHA-256: 9fb9ee0f24b39d40b6d517ab43a0412b6a3f09ea5d7b6c47f3b5c654aa9eb9f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users to potentially malicious or phishing content, leveraging a technique often seen in SEO poisoning or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fashioneducation.ru/userfiles/file/mefuwazuvezok.pdf In PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/82862805535.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/c7qrcia0fpv7gtf6uk9r15hvf8/xegisokava.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/rht6i74t95vkq6vl6s16cbduf8/54411249932.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/jetupixizipav.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/kgevhnp3deipn19diq7qrtsc2p/12162075793.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202159218562852.pdfIn PDF document text
    • https://anfauglir.com/images/file/dizukisugitivadoriwilene.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/4fb2e4c5e2568e4e1302c350f9a9513d/tabawitopumosowufetifev.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/2794138185.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/jodibapoxabunomafasuriv.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3615f5f2c8---29535279452.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec00a5e8bc---fapiwasixezeni.pdfIn PDF document text
    • http://sb-78.ru/files/file/55456900834.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/15555480158.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/56610581801.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/simokutorovanabivexax.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608564cf6883f---19774214795.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848be233445---depiramapipaludexexerav.pdfIn PDF document text
    • https://makenie.com/upload/files/noxubuvezujifo.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757eef3da06---94287106706.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/38963327431.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/64132691350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=why+is+my+kidde+smoke+alarm+flashing+greenPDF 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_off0000fdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBA 16764 bytes
SHA-256: a2543130a3401ecbf713b4fd3e9479d0391a22b13b955e85b455b7998594201e
font_01_sfnt_off00012973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 10904 bytes
SHA-256: 0e02271737a276e0da0baf3a8149add6feadffaf289bba32962d3d4c8d99e0a8
font_02_sfnt_off0001423f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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