Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a19142fda7f1e16…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 09:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df48d2f5825e3a8f5fa3fc92a7bcc088 SHA-1: 17e6c64fef263acbcde60fa890a46262573fbe5b SHA-256: 2a19142fda7f1e16874564d02eed7ab6224e62966c5c500c5e21fc3eddb0ef13
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/7c25f87b60398ca4d9af22f4af7beea8/92953967948.pdf
    • https://linhquan-group.com/upload/ck/files/72995741623.pdf
    • http://qca.ch/userfiles/file/29875532845.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2769b03353---86875091702.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/29757618580.pdf
    • http://www.niziointerior.pl/upload/file/kuwub.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/8bmimciahtnipa96u37abb5rfn/bikajufogefipatigim.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c956ef99d57---92144979826.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607357ae54269---maxakijepagatek.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b49d8edaeb861da3cd660a69bffe7ce2/tiwulelodikadexabenububim.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e96a2d461---83705145453.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc98e36ed---zexedubulevemolabimadozib.pdf
    • https://alariel.be/userfiles/file/31293981291.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/dfjgj36je8d7h9k022hebs8klf/gelidotezufakuvu.pdf
    • http://digivideos.net/ckfinder/userfiles/files/1914358073.pdf
    • http://csc010.com/userfiles/file/20210723083644_wi84fl.pdf
    • http://tuyothuyluc.vn/webroot/img/files/fapudexeja.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607657ccd7052---jenolituzemovafirelupawag.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/2ec76efff1233c2c56f103079cbdb1cc/firoxadiwokajiziva.pdf
    • http://viprealestatebrokers.com/userfiles/files/konujopebujiwigatalad.pdf
    • http://gzafjc.com/uploadfile/files/muwutokabupasigikepoto.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=assam+hslc+exam+routine+2019+pdf+download
    • 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_off0000d5c3.bin
c9383a6704b5d23d9e02f788ec246cb60573671ea3379b8b6c96dcaf65fee206
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C3 11616 bytes
font_01_sfnt_off0000f150.bin
d32f97bceee8726586932b3cbb1e2ff6b32a49b8234752ffd78beb24b89e3335
pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 17504 bytes
font_02_sfnt_off00011e44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E44 16792 bytes