Malicious PDF — malware analysis report

Static analysis result for SHA-256 0569556f4f4fb569…

MALICIOUS

PDF

88.1 KB Created: 2021-08-08 06:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 630ac462088fafb2dc0839473bdaa5bc SHA-1: ce8ccf0112f59eb07e938764c0d517a27bf1ca98 SHA-256: 0569556f4f4fb5699ceb8abf62d8b7e93022148580568ae8699b57b1a6483917
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised or disposable domains, suggesting a phishing or redirection scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607e03c519bc7---banubuj.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/70640260545.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ck7ksg86mg7oioamd78ef6405e/fezexijatologanatoxaso.pdf
    • http://coumert.com/images/file/14069588249.pdf
    • https://balajitutorial.com/admin/userfiles/file/vifixilasenetonunig.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a271a10534---62264428120.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a4fcb4c8eb831b5de394d3ec6ac10d84/59298908896.pdf
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/jotiwigizuruvaf.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ffd85a3c---petiw.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/rs0l4lovol1ug246okeq8qvlj3/nejomim.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/7267d49054c705b430561e3f735a2721/68629041627.pdf
    • https://foundryindia.org/userfiles/file/temorukiwitifimakazemola.pdf
    • http://goldnumber.info/userfiles/file/21852061813.pdf
    • http://hyunbulsa.org/~ewedd2/userfiles/file/menevutarezebonabuvu.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/dgd0l9b047cjrci91i3iojfv27/48620710679.pdf
    • http://cedule-plachty.cz/files/file/jakalufiwitigejasafi.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/6sc0frkjrgth5gphn1jq7ulo2f/mofinebobuzowup.pdf
    • http://bike-aholic.com/UserFiles/file/rowogapo.pdf
    • https://permargi.com/files/galeria/files/93306052131.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c344aa43504600dfb2a9943cfd3940f8/56901972532.pdf
    • http://aite-materials.com/upfiles/file/kovan.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c3a573884---34179495049.pdf
    • https://cantarefides.ro/admin/userfiles/file/sexajifemitezop.pdf
    • http://manleyboone.com/clients/3/3d/3dd19be848c73b0ce3a0430f7fd535f3/File/fikalolanix.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+long+prevailing+wage+determination+take+2019
    • 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_off0000f0db.bin
0318daa102c166be37b738a88c2a511a06022d2c3d89a2fda84cae5779006e72
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 11264 bytes
font_01_sfnt_off00010b23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 16792 bytes
font_02_sfnt_off00012335.bin
0e530eae294bdfb1f820e083b3b63806b225fe2fec878c174c44a37356599986
pdf-font-stream PDF embedded font (sfnt) at offset 0x12335 17196 bytes