Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acd25cd48cca5ed…

MALICIOUS

PDF

71.3 KB Created: 2021-09-03 10:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e9bbdb834fc2692345688682aba38831 SHA-1: 2ecd4591f0f8958b00a72068b4e8a673d6698b9c SHA-256: 3acd25cd48cca5ed0ab2856e7eb222eb112d11a266907d7f0782d33f659c70eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to disposable hosting and compromised CMS upload directories, suggesting an attempt to obscure the true destination or leverage compromised infrastructure. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the overall structure points towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mimpi1pusat.com/contents//files/13843664721.pdf In PDF document text
    • https://makenie.com/upload/files/tiwefanuxafunamareg.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/gigesufadowimipojazo.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/furibo.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/37280397955.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/kimiwukuramejaboresix.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/miwude.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/lazeboto.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/savape.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/40354944470.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/41380107172.pdfIn PDF document text
    • https://petikdaun.com/contents/files/jexipojofafinini.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/wowazego.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/efbfd6dd7b22e88422a32a65feeb5f38/85821625775.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/tar8scsnrkohm95a8qlp0ia1jn/76727907917.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/26898555314.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/52e64b82b6afc1adb3307feeccebd278/mojotupofopinumukorelirox.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/jowufimem.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/83691215951.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210627041241.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/duteme.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9177b27ab---51852898066.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/cjrf5n7e2au5ke4coabl601ngn/55530612873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=odontologia+estetica+miyashita+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_off0000b3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB8 11104 bytes
SHA-256: 2ef25ae2eafb3181ea4e776eef6f87abee0dc12fad08e13b7e80b4a3a6f34d98
font_02_sfnt_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 16584 bytes
SHA-256: 7ef44420f7aaa02098e8c68b29236876bb8823c65b4af02df057c88f8aba94f2

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