Malicious PDF — malware analysis report

Static analysis result for SHA-256 f612c7e903a62cb8…

MALICIOUS

PDF

78.1 KB Created: 2021-10-04 22:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95f4186aaba34f3cab4d39623718309f SHA-1: b176f1b3dda8ce908b132f924674a39f5ad74585 SHA-256: f612c7e903a62cb81b8c90af1129f4346fa3c072dd39613568ffa7a1ec34e4dd
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ke-sen.com/userfiles/file/1632194423.pdf
    • http://pincailight.com/zk/UploadFile/file/2021091314174273499.pdf
    • https://girisimhaber.com/uploads/file/jorugigan.pdf
    • http://cjmfgx.morefriendship.com/upload/files/zafefini.pdf
    • http://cuoredicane.it/userfiles/files/80196286446.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16142a449062aa---kituvima.pdf
    • http://ingfrimale.com/userfiles/files/59433260248.pdf
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/lizefonobojolupozap.pdf
    • http://www.moyekolodin.com/files/joludosoderoxemeril.pdf
    • http://4els.ru/uploads/images/files/61290523539.pdf
    • https://fullmagicweekend.com/ckfinder/userfiles/files/sorigemulifaraboxaxituzu.pdf
    • https://behagi.eus/files/galeria/files/37063287651.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ri7akpb0veu4ca9dcgq60pufd2/papivulinesesesumekimixi.pdf
    • http://www.smartusb.info/images/library/File/doxixosevita.pdf
    • https://htapigroup3.com/contents/files/lusekanuxexidaxonujul.pdf
    • http://tdvvietnam.vn/webroot/img/files/dibejazakorile.pdf
    • http://www.mousumibanerjee.com/fckimages/file/juketenovelexos.pdf
    • http://unibeauty.com.br/ckfinder/userfiles/files/werugopusewow.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161437142ae43b---95018307290.pdf
    • http://chaukitchen.com/uploads/files/28441187752.pdf
    • http://changwontour.kr/FileData/ckfinder/files/20210929_DEBAAF132DBCE89E.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613809b686e0d---75486562385.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=examples+of+schedule+v+drugs
    • 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_off0000c7ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BA 16792 bytes
font_01_sfnt_off0000dfcc.bin
ba1ddfebf5c3598ce74f101386a7cb238b99bb1d2069cb324cee2b4407ae7828
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCC 18292 bytes
font_02_sfnt_off00010fb0.bin
dfc3911c00e7a8cf9378e19677d52d5271c3de8da0019579e8191d6bf1588bb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 11024 bytes