Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efee6a37ec370a3…

MALICIOUS

PDF

88.2 KB Created: 2021-07-05 19:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11b16712f21373a64081ad572f483d56 SHA-1: 81e892c8b8f3517a3ce0a76775bba91e28fb9a56 SHA-256: 3efee6a37ec370a3eb94e36171477779287c197ded3dc05bbba163b304118279
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cwesp.biz/upload/file/28682220910.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/vupadaf.pdf
    • https://appvid.eus/userfiles/files/32428405367.pdf
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/muwurifawimaf.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/37796949008.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/714d95433a475b72c6bcc18a6f1d506f/79734411109.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/3547903120.pdf
    • http://schokobrunnen.com/idata/fujaratemevexadewege.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d4a018250---zibikore.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160709cde76bdf---20456887186.pdf
    • https://kuepancong.com/contents//files/wabasodetagovimukara.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/d1f89270e30644e570683ce665f40655/barinetigovafimetaxex.pdf
    • https://familienarbeit3plus.ch/userfiles/files/xodejagi.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/668fa53daff5e1a5d5120048a8d813d2/37498974241.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d10374d25b8f1197062cf569d728adfa/lubatopugovivaxezus.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce371e214e---puporepezojurorujof.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247dab16b7---gojolatifikivoziwodoti.pdf
    • http://meble-tk.pl/userfiles/file/24331668587.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/42e745210c5df81c38f4ec3f260b44b6/52401648954.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f1f5b83afc56142fc893b060b2983ae1/retibirixaxap.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c973cba7ded---rajelabulisegetukaxos.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/2d9ea654fd8124cb15d5ad5a5730ae6a/moxej.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16097fbac8dfc3---mubexexuta.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=fix+sd+card+not+detected+android
    • 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_off0000f4a6.bin
8c2f917dcdea606929dadb67a916718ca8ed4663ea27621b7c924b32d5ba8d27
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 17308 bytes
font_01_sfnt_off00012202.bin
04f1ab1ab969538ec278bfa0c82c9b697a2c4568a79d7e6641e6c3ba1eda4082
pdf-font-stream PDF embedded font (sfnt) at offset 0x12202 10396 bytes
font_02_sfnt_off000139ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139AE 16792 bytes