Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95dda7d19f98344…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 12:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 70022b77ce167591821999affc836011 SHA-1: bc7be24b807b4134b00553ee24837e8bfef1f790 SHA-256: d95dda7d19f98344c1e2c4447e0cb4b0e5731eb668dd12bd108d4b46802359bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URI heuristics and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://yunnanyingxiang.com/ckfinder/userfiles/files/bexubokuf.pdf In PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/32230301407.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d92e005d58---91035818711.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/somojopunugazubawefe.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d660caad712---kuzotomozome.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/gerawezu.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/dopotijowokete.pdfIn PDF document text
    • http://terminsk.by/pics/files/fasaxewuputoxemezi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c399f89b266---feguzomaruretururiwe.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///91076205075.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611545fce1180---58023126431.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0e5acf91ad7b211e3facf00c6cb9fc4e/19341219986.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97868e3fd---28858700415.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/41568412624.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/lurugerigezegobezof.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/vararekesolukon.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/44135504898.pdfIn PDF document text
    • https://begili.com/uploads/image/files/dumaweg.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/52558971180.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/tigosebasipo.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/xogekapixinelopos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mathematical+tools+for+applied+multivariate+analysis+pdfPDF link annotation
    • 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_off0000d6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 18104 bytes
SHA-256: 42057590c35114b421005e731a52da331b4184fa138aed2ccab6af0ed301c88f
font_01_sfnt_off00010661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 11156 bytes
SHA-256: 25d4d8691bde65f408161990d21c53fe29e3c9aa19bca8481356ad3223dfb9fb
font_02_sfnt_off00012053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1