Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e5543f1d2b7f50…

MALICIOUS

PDF

88.6 KB Created: 2021-08-11 20:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af93b59a207bc7bf8feb5e4bb409cbd2 SHA-1: 703795854d7cde760e3cdd138cdb81c93c39db21 SHA-256: c2e5543f1d2b7f50b057372fa4c7ec7ebcf91d12d239355beb70b76844042b8d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, likely to manipulate search engine rankings or redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7367

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/kig1ljjhtftpnq7mp19obhlr7r/30624208489.pdf In PDF document text
    • https://tavcam.com/upload/ckfinder/files/jebozisoxisajogat.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210718_7C566E4426A71537.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/36550834551.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/97797051445.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/8324283185.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/momasewolinaxab.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/lurodekitovunenele.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/15268979931.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/31600273607.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/nemaroboganajini.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/9f9d067de9fc02cc241f28834b1d7252/matejesesemixa.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ac0f5da5d96dda8b666d8a288ff8916d/13289870563.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/96d53cc814827d96435ae334dc8ca726/98937635106.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/lejixinosozimakikexe.pdfIn PDF document text
    • http://myredm.ru/uploads/file/fevewukuxujatotubo.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d6ce68c2a---zupuxiru.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/pakaxojoge.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/66066564134.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/vimigajegog.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/tuxujuroxuvamujebemalum.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/xigedakifafuvasuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+install+bilstein+5100+tacomaPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 10816 bytes
SHA-256: 26717401382359c3d2cb9d3257e8ee56925ed81d8aaf75eb547103dd38f5889d
font_01_sfnt_off00011414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C26 18304 bytes
SHA-256: 2f9f02a322e1193bc7d4afbb32c7ced2f4bf812ffc7abec7b2d4c0ff9c799a08