Malicious PDF — malware analysis report

Static analysis result for SHA-256 321083f1a713aa7b…

MALICIOUS

PDF

88.2 KB Created: 2021-09-03 06:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 520bab0327b38eb84427cf8227fdb9e9 SHA-1: 63df5e54ee36887e4e552bab2f098b8f1a73fbb8 SHA-256: 321083f1a713aa7b2744b6144734b55c88753e166c8fc39f10716950afdf322b
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of external URIs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dancephoto.ru/userfiles/files/176170352.pdf
    • https://zapret-rf.org/web/img/podborky/files/kixanupekitudiguwavoni.pdf
    • https://mgrenginiai.lt/ckfinder/userfiles/files/35647179413.pdf
    • https://alexandrapanayotou.com/web/images/static/file/42021104958.pdf
    • http://boissee.fr/userfiles/file/1815567324.pdf
    • http://sevimticaret.net/userfiles/file/visedazawo.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/gunavirorofasavufumaba.pdf
    • http://daehwa.info/uploaded/file/4950260563.pdf
    • https://starbox.fr/img/files/59868971283.pdf
    • https://birsamundapark.in/userfiles/files/ludoji.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/55504852844.pdf
    • http://stylekd.ru/files/sewewege.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/iqaac6jcg8qo9nlp1fj0asmmq5/lipalurisafigow.pdf
    • http://ogledalata.bg/uploads/pages/files/83987527961.pdf
    • https://dollarplus98.com/images/upload/files/mijubuvenavikafe.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf4b24e927---xuvubimafidap.pdf
    • http://thechelseaff.com/user_uploads/files/52449837558.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609c142c22b62---87783310515.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16094f96589705---35232259908.pdf
    • http://thanhnienxp.com/vietkiendo/upload/file/figenapapirewode.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161040fab1ad4b---85008476542.pdf
    • http://eastbrunswickliving.com/clients/77672/File/44843511019.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=efficiently+inefficient+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_off0000f427.bin
c359ad3c152873cb5695d4a26268e76a4f76b3743b040780ed2c9ccc1d963259
pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 18216 bytes
font_01_sfnt_off000122b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 16792 bytes
font_02_sfnt_off00013ac9.bin
4f49f5e06d4deb7eed64079e4261dd81dfe7c5d251cde46c778177081951c748
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC9 10528 bytes