Malicious PDF — malware analysis report

Static analysis result for SHA-256 e574b790e2997666…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 13:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99fa157840b6350a86f9dd6a21f294e5 SHA-1: f727075ad95cbd254a04a3e551c04210ca4f7b20 SHA-256: e574b790e29976668d43d42a4584c9f2200881f69cc4241fb96fc23a12af2f46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=sweating+in+sleep+cold+room
    • https://pass-eco-energies.com/ckfinder/userfiles/files/69036146293.pdf
    • http://adamlegal.com/userfiles/file/66176177763.pdf
    • https://villatoscana-pi.it/userfiles/file/40295882347.pdf
    • https://blnk.eu/userfiles/files/dupetifumojaki.pdf
    • https://sibconsulting.com/contents//files/bavozunavakejalekididet.pdf
    • http://kammatrans.com/userfiles/files/gafafakibukuxonij.pdf
    • http://modaxch.com/userfiles/files/1180352425.pdf
    • http://fruhmann-elektrotechnik.at/giwilix.pdf
    • http://ipublicity.cz/data/file/wevawiselunufijutumaz.pdf
    • http://toyotaquangninh.org/data/dulieu/files/faxesupu.pdf
    • http://artepcb.com/upload/files/turutifovipe.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104fce885114---14767556769.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609578833767a---47050486284.pdf
    • http://studiotecnicobonoli.com/userfiles/files/kigikipus.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/71507791454.pdf
    • http://cheumst.com/upload/fckeditor/file/lewudizekuzolurapebagex.pdf
    • http://4998horo.gmmwireless.com/contents/files/57146930083.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/lenajegejusamaronuridema.pdf
    • https://aashianarealty.com/file/pepokawovolivetidavara.pdf
    • http://aatmicscience.org/asuserfiles/file/zekejex.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/5c9c114b069a5c5f39ad5653570a45c6/samoke.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e52d1188eee---wufilaworapadomiso.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c54e08a165d---83985163531.pdf
    • http://immobilieninvestors.eu/userfiles/file/tofov.pdf
    • 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_off0000ed17.bin
e5acb392b9271b2d5f17b07bb7723a48196696ea7dcc7bf6629f79eeb34d5bfc
pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 11020 bytes
font_01_sfnt_off00010683.bin
4f2ad5f63de9cd6af0218a970a076b15eb3cce4efb4fb7f9c461bf38ae69c5bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10683 18372 bytes
font_02_sfnt_off000135cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135CB 16792 bytes