Malicious PDF — malware analysis report

Static analysis result for SHA-256 93064cb6ef26c8a9…

MALICIOUS

PDF

86.3 KB Created: 2021-07-09 14:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 429f6d2b47aa8cad57ce520da3ac7579 SHA-1: c103d8c1575f41b2620555902fdc5e4c17c74405 SHA-256: 93064cb6ef26c8a9bb5e0eee13d142caafc2b71032666d87f3c542807de59e17
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users to potentially malicious content or phishing sites.

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://balogmihaly.hu/UserFiles/file/reseviwuxi.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/54443220428f7f900f04be4bd5870842/3572227600.pdf
    • http://seabeachthailand.com/UserFiles/file/nitavoganibep.pdf
    • https://petrovsky14.ru/docs/files/tonusazitojukoxawugudov.pdf
    • https://monyetjoget.com/contents//files/3741124887.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/64f4987dced2f021c93f794816313cd9/71912979523.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xulotasesadiwe.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070472ad307d---34072032023.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58d27268ac---23926195497.pdf
    • http://onlinetradeshow.ir/uploads/files/15540581677.pdf
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/34940232969.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947f7a32afa---84900236241.pdf
    • https://marcuspietrek.de/MARCUS/files/file/defomofukivaxaforig.pdf
    • http://kayamedbursa.com/userfiles/file/85526490399.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/41e1eac1e97b080d795d588eb0e429f0/xorudaji.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/d0fb9ddb189519c989dc32c7f8ea0030/vanafazewupobodew.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f70e4e1b93---mamoluzonatomotaxulif.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78be52297c---liligerebaru.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/aad2cb724762f6a7be0df010c1d4af95/fagokerexedisimizoxega.pdf
    • http://fecoil.com/userfiles/file/56360809260.pdf
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/nigojenadidijajoxiputemew.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/affc60e7f5ea59ca8a3e09befe3246bb/8682899357.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+new+year%27s+eve+ball
    • 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_off0000ee61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 16792 bytes
font_01_sfnt_off00010678.bin
3d26d7d00680c01ef5a7ae02bbae5970d655b639fb23cbc92d5ce62eee18a937
pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 10296 bytes
font_02_sfnt_off00011daf.bin
f65cb21c4f19c3fa8236911400ee312dfba404aa3272e1027a01421f6d8aeb11
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 17592 bytes