Malicious PDF — malware analysis report

Static analysis result for SHA-256 f02f7d410ffe2585…

MALICIOUS

PDF

107.7 KB Created: 2021-07-05 17:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b2fb1994e616b0c59d81daff300a197 SHA-1: a411edac8df70b68a674fb5c9b673a5589e77a2d SHA-256: f02f7d410ffe2585a9a70f81507cf49f280d0adcd0d4145426d88ee3386262cb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to PDF files hosted on compromised websites, suggesting an attempt at SEO poisoning or malware distribution. The presence of multiple distinct hosts and the use of compromised CMS upload storage further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://turagent007.ru/userfiles/file/pofuwagefuduwamav.pdf
    • http://kangs78.com/clients/66216/File/97598089811.pdf
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/dotupikiwepuvanuvuduvur.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/527f215578f208118316bc1576b3e119/51433223472.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/1243eeb39cb1323f40fa7f9fbc44fdd8/xirebifaburibafaxetefebim.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/400e15ca259564d266d4a266f0a7b32f/gutaxudegigabozava.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e8ab8f6f59c5e1e3d7d80e6997ed37e7/81048373347.pdf
    • http://abwcolley.com/uploads/files/dapukadamavigupuk.pdf
    • http://edgecs.net/documents/niwefimusitukolo.pdf
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/72469447828.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/225b9a70495884c2e172202132d26984/rakasarun.pdf
    • http://okmarin.ru/userfiles/file/xepemadezewajor.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/6b9si8unuoo9k1kc52hm6v7q17/31512574741.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071dbce7c6ea---84540713090.pdf
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42142341162.pdf
    • http://newdimension.su/userfiles/file/30227489782.pdf
    • https://debcopharma.com/userfiles/file/lesevovaduraberote.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160730f359ccf7---61362538984.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa1086918---39099218885.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3ef0c44d9---gowiko.pdf
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/97565133063.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d385c3f416---76042810968.pdf
    • http://hoinhikhoavn.com/img/files/kojodobefijizifapawawijeg.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+4th+idiot
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb7c.bin
ffd1fc7e251ad4afafe25b16bc277c21b847bc53852d845379dd08b90c5caade
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 18552 bytes
font_01_sfnt_off00012cb3.bin
e6f1e7283578452239365e81f59edd30e658fa5bb421221e70322a3dd4ce078e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB3 9808 bytes
font_02_sfnt_off0001425f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1425F 16792 bytes
font_03_sfnt_off00015a6d.bin
dcaf02faac062ef8119efacadd36872cd2c7d5bc6d79523e6bff6eb892b764dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A6D 24292 bytes