Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e4f5669ee9a52f…

MALICIOUS

PDF

122.8 KB Created: 2021-06-26 04:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7e1616ce2b627fb416a7dcd540128a6 SHA-1: 128079bff84510767a172ac1bbcb1f562defcaa5 SHA-256: 35e4f5669ee9a52f83449ba39acb4a1eb6f38aea4f02a668f41dab4186f74d02
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous links pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure itself does not contain readable text, but the heuristic firings strongly suggest a malicious intent related to link farms and compromised uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://novussiteyonetimi.com/uploads/file/sawadigozosinarirenim.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073b26140b32---62933700182.pdf
    • http://dzbnf.com/upload/file///xanika.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089aa777c2d0---58841906353.pdf
    • http://benthanhsgfarm.com/images/uploads/files/26745774972.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0lj11irco9keiucjfu50b5mag5/juraw.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608d581fdc117---darabu.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/8426233798.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a626954b8b3---54362166215.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a5f437f41---julovebogamisakozewibed.pdf
    • http://pogservice.ru/userfiles/file/7914275117.pdf
    • http://vipnjl.com/userfiles/files/64336497082.pdf
    • http://canphantich.net/Images_upload/files/zexajamoxavibujipo.pdf
    • https://arvikabc.com/images/uploadedimages/file/deparebogededuwumaxof.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/kbdjag8ljn13399v7o0ppgp468/97143588362.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83263e4e67---98671781211.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/74382667214.pdf
    • http://kirilmazbardak.com/userfiles/file/17515995222.pdf
    • https://webmenuplus.com/images/file/73590124922.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/v1bt4ccncj2un7oc9v2ldk8kbo/rumupebijudo.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087c58b1441b---20521240114.pdf
    • http://rallyteamwalraven.nl/file/54215722685.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2f14586d65ebd7b5503876ff6a865e5/71073262177.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/mfsgfvi474mrf9mmnhrlk0131i/joraf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=over+exuberant+meaning
    • 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_off00017e61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17E61 16792 bytes
font_01_sfnt_off00019678.bin
043bd688cbd0d166fb750c19fec3375370e623bc0d916f41563c95a41116815f
pdf-font-stream PDF embedded font (sfnt) at offset 0x19678 10548 bytes
font_02_sfnt_off0001ae91.bin
8d170cb824014fd2f96925c2f8ec24d9d22aee4d354ca6d6b0d5731f914204fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE91 17708 bytes