Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c696dea825efe0e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 18:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9c617a45014fe12b4c68fe8a9993fef SHA-1: ea40c46e686a86bcc770b6235753f58ed307d7c2 SHA-256: 1c696dea825efe0ef4a0d22d5bd40def9a8f6da53049f5df2beb83637cbb54fc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of a callback lure heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://originalcheck.it/public/img_admin/file///48513189084.pdf In PDF document text
    • http://kingsap.com/file_media/file_image/file/30336231191.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/ranorepakegosobivamegil.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/lozifudatix.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/13109801364.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c546b9471e---76898707467.pdfIn PDF document text
    • http://congtyvima.com/images/Download/mivibezeronite.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb38c0d71---90593682246.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/4040451290.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/40413839188.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/sewoxipu.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/29171733823.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/21511751506.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/56482058834.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/bemodivazixelowuguripogox.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161393243991e1---57034021997.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6f7dd97b---88762270524.pdfIn PDF document text
    • http://npas.ru/pic/file/fatawubutemixisufa.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/69352865131.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/pidoxudumidamiluduselizo.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/zupolebosijazixepuwu.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/25743473088.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/14037428577.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/81107126853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hot+tub+time+machine+full+movie+freePDF 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_off0000d16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16F 10732 bytes
SHA-256: da2e1d46c524840b0296ba4668999823a5f6f4cd7eb734640d5da6a8806bef41
font_01_sfnt_off0000e9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 19728 bytes
SHA-256: 83d67dea0eefcf5bb6e14e975e60450f990a5438f452fdec972b1053292fcbae
font_02_sfnt_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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