Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5640e50ea1aaa8…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 14:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5f9ece6e4d052827baaa1011456d1ac SHA-1: a9a51791a5a0eebc37400edb8da9c5fdf681c6f0 SHA-256: cf5640e50ea1aaa815193875fc90f0e534cd567071ef4c721f0772548ea361ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of external URI links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=il+trono+di+spade+vol+2+pdf PDF link annotation
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/09547870f34cf6675baffe2dff27f64c/86757948954.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2f2e65023---74750863076.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/78015008610.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4smvgbv0f766bevn9s84c5pm65/38834352736.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/43922036162.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/49715134153.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9690d657b5---xatazuzelima.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611d5b8da9eb4---vawopoborukutalamexo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16097472004d78---54678403186.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/bosujedejetasamusi.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/kaxapobu.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/2e1dbd8210f07c0201a53ff4cd8baca4/famixenikuvebivefep.pdfIn PDF document text
    • http://fittbikese.hu/files/file/47460736876.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/tutawelasubexanusuzosogiv.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/garunirerawaxonojajebizo.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/xinadagujama.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f17e330d---tamizivoka.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acb8f99c37b---55650585392.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac670025d48---73501035730.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/52668631967.pdfIn PDF document text
    • https://signika.pl/Upload/file/45169505360.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/rutetopix.pdfIn PDF document text
    • https://landbar.com/upload/files/mivemora.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/ganowitomopumodexumur.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607796bda76c3---7011405009.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 10628 bytes
SHA-256: a5661148e945192c5f10e75e20ba4e26e88f77727a51c0327bedf08a5289969c
font_02_sfnt_off000114e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E9 17308 bytes
SHA-256: 809efb0465ed09aba05eb0099f4c7112108f3042564231faa85b001ade816df2

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