Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd7ceeaedf2e264…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 05:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 40add72dadf49e117224a58ac2cdff22 SHA-1: cc9881a3c37a950a1ef09ce536088bb70c329a89 SHA-256: 5fd7ceeaedf2e264689d7d79bba7a57c9de6b084422ec18a464a07d18191cf01
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers confirm the malicious nature of the PDF. The primary attack pattern involves tricking users into clicking these links, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://presssimayeshahr.ir/pic/file/81199818229.pdf In PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c81f728dd6---98138903161.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/tadejinaf.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/22660866266.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/miselosoxakazojitamil.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/desetiselumumepilivojon.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/nubefizivefepat.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/765d014701873e1705b46ee45d7005fc/53945341568.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a712bea4a65---vimejavipemuxe.pdfIn PDF document text
    • http://usmleworkout.com/files/file/zajorajukijafamunawo.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/69336703911.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/fojupuxorulu.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/87915393339.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/unoi3o1hmnvu4va0l705jiv423/26259017398.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/88129109315.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210820185107.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/moziditom.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b79c29d591f---10661925723.pdfIn PDF document text
    • https://ms02bet.net/contents//files/86669536408.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/59658464874.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ac6967efceffc0cc2bd6272a57fdcd73/40978952474.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/gemolukisirikibadaluzoni.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/migepuliluvaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=synthetic+manual+transmission+fluid+o%27reillyPDF 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_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 11064 bytes
SHA-256: 798334bb925243db7ebd544fb974dbc083012dd25d2d83f2281a085ab0451b9e
font_01_sfnt_off0000fa47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 17732 bytes
SHA-256: f004789f8e45a422734e6c574d8bb1d6cc98aec711c7c3d83b010621a120b755

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