Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b022f733ab10f8a…

MALICIOUS

PDF

89.0 KB Created: 2021-09-04 18:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6b211d66e077273e7ec0c155047435de SHA-1: 2a09ae375d9b264679402ddce909f44150b897b1 SHA-256: 9b022f733ab10f8a7db9320dc7f4ce604ae5f367a37015210b0bad7596b81c1e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics points to a deliberate effort to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/popopo.pdf In PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/88489167675.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/d77f6s1hktmubdg4mlrsg1gge2/tukifagi.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/79842715028.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e878a59ba---xaduriraxesevete.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074798eddcd7---sanifirepibofikixupu.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/65906090914.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/52736960934.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0ebd799fbce7273cf6c714b0a2d028f/58302314126.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/77526171475.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/18123037544.pdfIn PDF document text
    • http://rcot.by/pics/files/5199502277.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/suleziwetizajeza.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/27258682731.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/18424606849.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/398f627ed1b2e6fa44c98f916b7875ff/73561471562.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/69558370221.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/71ca2a0de9c3c1e4bb4341a75cf16692/zejotubuzon.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/29248758996.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/borarixapabanul.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/58949130413.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/2d95e065a939a97ce8c7e0dd80452316/bovujegurotagupojakuzeve.pdfIn PDF document text
    • https://securitydm.com/slicice/file/nozaxugemedeluke.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/91509086722.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/16849215143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=learn+fluent+english+speaking+pdf+free+downloadPDF 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_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 11012 bytes
SHA-256: 255acafdc2aa3b4993c9521eacaf90be215d37aca04bf9e69dd5945409c818b3
font_01_sfnt_off00010d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D20 18548 bytes
SHA-256: c738b800a2bd0370a1a25f5e82dcd5801d95a0bfc52c86751fd1dfca414a1101
font_02_sfnt_off00013d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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