Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0d2bcf42e29a39…

MALICIOUS

PDF

87.5 KB Created: 2021-09-18 13:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59f0c699f41659328d2c5809fdb01cbd SHA-1: 123625036f6f98bbbc50a1857cc24db15e387583 SHA-256: 8c0d2bcf42e29a39c4bc58e507bea28125b1c5d2d727b2f021bdb7de99994a03
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure for link farming. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=final+fantasy+xiv+apk
    • http://laihoawedding.com/app/webroot/upload/files/vefupefolidujowosipaw.pdf
    • http://tmkb.org.tr/ckfinder/userfiles/files/30238065688.pdf
    • https://citytrafik.nu/images/file/ratemuxajawitezefi.pdf
    • http://www.euro-fly.eu/userfiles/files/78517502545.pdf
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/lirufuka.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161339740347fe---zobedax.pdf
    • https://egokituz.org/files/galeria/files/xapupusaxakaxowi.pdf
    • https://machnhaduong.com/images/uploads/files/nokuduwudafenoz.pdf
    • http://www.koeru.eu/failid/file/kuzosuxukisorabonorelije.pdf
    • http://hermandadperdon.es/userfiles/file/lesumabubedolevawenodo.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/terolonigixiwemewigoza.pdf
    • http://hitplus.eu/userfiles/file/76840974795.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132933be717e---pajiputesiga.pdf
    • http://constantcontinuity.com/membership/data/files/lugelomosow.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec62f1b76---55984799141.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/12291291418.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tejuwufapirekimadede.pdf
    • http://imhang.com/fckeditor/userfiles/image/31392064412.pdf
    • https://mama-light.net/business_school/uploads/file/narenononilewugali.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a55828468b7ec3483557cdfc1e95ce5d/11529232823.pdf
    • http://starinviter.com/ckimagefiles/78553999566.pdf
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/rilimepimeseme.pdf
    • http://hajnysport.cz/FCK_userfiles/file/zevusovovumid.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f091.bin
0bb92b9ba992928856c7049e59dfe22fcd5aab3464ca63409ab25ec2644f6a3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 18576 bytes
font_01_sfnt_off000120b5.bin
6aad4c5211b0f71085c312469b1700aab3d10d17e76beb408b6b448622ad5d8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 10348 bytes
font_02_sfnt_off0001382f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1382F 16792 bytes