Malicious PDF — malware analysis report

Static analysis result for SHA-256 93890eab59d7812b…

MALICIOUS

PDF

84.5 KB Created: 2021-07-01 17:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5212094d933752b9f303511d1f0187e SHA-1: 2e9136094ce0ab87d14eb798e2ded445b8ad7aa3 SHA-256: 93890eab59d7812b6fb83254568293bfc6207730b8dfadfc28dab2907a104fa6
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://koszyczarek.pl/userfiles/file/98747068594.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/0c4c715d84bcc782359bb1970edc2144/99661637800.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16073e90bbedd2---gilesazeraxijo.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/0f3e6c2e8e2cdf8f15496d9d3fe1d0bc/vavuzabovezutusajolixuz.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f039bb428c---senotakarale.pdf
    • http://stylekd.ru/files/bojobujiselu.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4bfb93f61---1064407107.pdf
    • http://uleshuzatshop.hu/files/file/1710957732.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1ca241f748f73471f2faaef12f511ab3/pipudaxam.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/881720c4ad3948ac6ebe4349e2478f0b/94036833401.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de65c974e9---gojafu.pdf
    • http://ipceurope.eu/assets/file/xafaxopesogamuvofebivax.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6485d85ae---wulitirafopuwuj.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/78431cc80b061f5d032bcfe861a8d3f5/magedimezu.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/96589044914.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d94ba8d1573---31668447151.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3f0c26c9---55871770815.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880331e3674---negidunasolunaronej.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6r9vjmvbiosli1eivptjn42em6/85825618398.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/9fa9c05212f9973474aa982488923efa/37393649265.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a6958731d41f5c13648c3755921dfa98/14423492455.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/fg7gir888mhp4qradtu6sebe6q/69398928359.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=yellow+discharge+causes
    • 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_off0000e963.bin
735076aa145fa70cae3bbdd7c8f93487784a618eba04eb59d2a00bfd1529e01d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 10616 bytes
font_01_sfnt_off0001019a.bin
12d7c936663165ac78bc2752735a4c9ecc391b777bb0b13d1bdf92f4e0c3876a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 16764 bytes
font_02_sfnt_off00012d26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D26 16792 bytes