Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e6d708c4381f86…

MALICIOUS

PDF

76.4 KB Created: 2021-09-06 03:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4385704da53f65ba210a6540de66ef6d SHA-1: 8644a1afe1c03e12eec975f07453dc16c27c8da8 SHA-256: c2e6d708c4381f8663e625f7836d7b2e1cf9bfbe5831152a231651077d61e686
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or content-luring campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://www.evisiontiendaonline.com/ckfinder/userfiles/files/84915319863.pdf
    • http://ed-web.cz/userfilesfile/53610187337.pdf
    • http://beiwendq.com/userfiles/file/92013340273.pdf
    • http://altaprecision.com/userfiles/file/84907762431.pdf
    • http://www.naturhalles.fr/fckeditor/userfiles/file/30668260397.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b599791d71b---potomex.pdf
    • http://ndt-tl.ru/upload/file/86096056093.pdf
    • http://01host.ru/userfiles/files/8412517875.pdf
    • http://altiro.nl/home/tjerk/file/17838964516.pdf
    • https://masihpt1.com/contents//files/burili.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16129b9fd86733---nejoteteduwe.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/7fc687bf10b389b906ed6898f1675520/7555570759.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/dc6e8c8d10e731d3fe7a767a08dd8fa9/38298108118.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/1468c52114ff65c87518230137144347/33821841596.pdf
    • http://buffagiuseppeinfissi.com/userfiles/files/90882021004.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c580518c858---zasurogalabotoma.pdf
    • http://strandedtattoo.net/file/jalaxawazotilekozeronuf.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5a6a840c8653194badbb6e4ab3e39fb0/wojakefaxofowuvorukekiza.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8426a88e7a---55796542222.pdf
    • http://robwalker.net/fckupload/file/94788562213.pdf
    • http://tyros-club.de/userfiles/file/fizufokedokatopar.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/37237969948.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/32rkldk4m4p62cmogc90cj6tm5/banojofekapunoliv.pdf
    • http://chinajnbt.com/images/upload/File/rewevagofowakowosajufumiw.pdf
    • https://xn--80aggmy8c6c.net/UserFiles/File/34021807464.pdf
    • http://scpt.it/userfiles/files/18359818989.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=connect+to+wifi+windows+10+manually
    • 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_off0000c759.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC759 16792 bytes
font_01_sfnt_off0000df70.bin
90f26ed1e3aad4e3f47165ec9e6a2255c1d3684df18618b343022064ceca1936
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 11044 bytes
font_02_sfnt_off0000f949.bin
ef0b424e9cd9a04081aa07092dd203ee206a9dc60d67ec59fccc07521ddfd63f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 16428 bytes