Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d9bdef71d19490…

MALICIOUS

PDF

98.4 KB Created: 2021-09-06 21:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ac0968d652003c6220675b0a962605d SHA-1: cc198581844d7b2be4253240a0e15ef09d17705e SHA-256: 79d9bdef71d194903ec1c81ecfcd047a8340119a84959f079eb1d64b7e50cd6d
96 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics indicate malicious intent, specifically identifying the document as a link farm. Several URLs point to compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute further malicious content or manipulate search engine results. No scripts were extracted from this sample, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

Heuristics 5

  • 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://folientastaturen.pl/_data/file/gedalawagaju.pdf
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/69340305110.pdf
    • http://medicaldistri.com/ckfinder_files/files/kekovuzobedu.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c881257973---zovulatimawinorubawi.pdf
    • http://mopi.eu/ckfinder/userfiles/files/91569880374.pdf
    • https://efficimm.fr/userfiles/files/78841686990.pdf
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210612_CAF88CD244EEB2B6.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/21eea9e2586f2ea6ad9c2a4b05b9cd0a/27058223850.pdf
    • https://tecnomatec.cl/upload/file/xewutovejemorakarifotep.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b26d69172---77572090111.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/dc0d09e4a66b7dadb1ee1ad8f3e53fc2/70842477995.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/e4kriknj0v6do0i8j4edsmgpa7/80062894988.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/0e1709f2375de3f213d9890d756c5097/ziludape.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161143d474e59b---vuxigegikofegumilil.pdf
    • http://perlawarmii.pl/userfiles/file/benivisazepef.pdf
    • http://abwcrainhwy.com/uploads/files/50980769878.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/lah2l9hc473kmc4p3c44r59oe7/8663624677.pdf
    • http://fittbike.hu/files/file/31371252681.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086be7921daa---tonoro.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a34e5fb13ad0407a5e5c12bd8df85a07/20640628735.pdf
    • http://wp-kancelaria.com/userfiles/file/tizidafevuvakogonaso.pdf
    • http://dwhs79.com/clients/15834/File/kifiduvowejanoraduperop.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a2df09855---fodekubinifinozogiwolojeb.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gst+meaning+in+kannada+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e955.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 16792 bytes
font_01_sfnt_off00010166.bin
1818292ed7b58cf4b94b85a18e225d3eae0643fdbfba6e555fc7fab45cf25e58
pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 16356 bytes
font_02_sfnt_off00011784.bin
6482c53f47612d4fa2d7125ddfabe8626d0683c576fd04d05eb677ddf3ecf657
pdf-font-stream PDF embedded font (sfnt) at offset 0x11784 1804 bytes
font_03_sfnt_off00012007.bin
5e136344d3279095962e07f66c43737864cfc8e31ca04ea54f90eab734bc19c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12007 10704 bytes
font_04_sfnt_off00013867.bin
22ace33e5920c49d473b073ea3d9be13ea895863a7fbcc1eea32d2feaf796c58
pdf-font-stream PDF embedded font (sfnt) at offset 0x13867 26196 bytes