Malicious PDF — malware analysis report

Static analysis result for SHA-256 028ad03719d50e44…

MALICIOUS

PDF

88.4 KB Created: 2021-08-05 06:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3ace0c9e91f6adb42869af57e7f0e555 SHA-1: 6e3c00e1f5cbfb4222934899a22dfe492c8f838d SHA-256: 028ad03719d50e44c9d88cee1bd0aeeb7730d915976b5bdf96835870722f46be
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised hosting or disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms strongly indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://lamorenj.com/userfiles/files/14138344610.pdf In PDF document text
    • http://christopherdallo.com/file/werifidamijabonevotuti.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/67095724368.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160722c31551ca---depitiruginusipefuxapit.pdfIn PDF document text
    • http://gibisch.biz/files/files/lejaxanuxekisosazar.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/39481949173.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/d4f9g3gqmalina7qi0bbs74mbr/98568458474.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/wopiniwivexinaji.pdfIn PDF document text
    • http://dentali.cz/files/files/11151271231.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14262250065.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/tivuromijufutinidim.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/kikupetoterekakajuzewe.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/47212453497.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072f256f0db8---nazimodud.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/vonelikikimotunijug.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad2010da10---jisowekab.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075495a3346f---labejosateka.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/redobabomovedutuvur.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///98604387422.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/jubugajubuwewolakewub.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/98909565377.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/77937846425.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098e857808fc---rakakinukofi.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/5258114369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=maytag+bravos+xl+dryer+not+drying+completelyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 11272 bytes
SHA-256: b0a026f09fd6a8449bd8c7dbdeccb4c6ff70e8991b7f9f6545836b5ffb139b9a
font_01_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 18600 bytes
SHA-256: 665fe34c3464c2d21e77bd48631ac966a0947c94a9893ed424f340bc63e78576

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