Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ef6a39c289afd6…

MALICIOUS

PDF

169.2 KB Created: 2021-07-01 15:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c1cf6b4d0dc213978445465fb0728db3 SHA-1: af1a4a726bd57a36127ebb644b040152150d098e SHA-256: 51ef6a39c289afd66f602b92f8628e4d673ae26a675c91d40f311f2ff8ba99d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The primary purpose appears to be to redirect users to malicious content or phishing sites, leveraging a common tactic for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9428

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://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/65501559064.pdf In PDF document text
    • http://beiwendq.com/userfiles/file/gapofafugage.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1cd3e8f400881e35d346fcad43209160/59211526294.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d6862bc4606---nixorekurebabakutomakowug.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/45346748535.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072005ba8105---51800239296.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/11d8702c9c33efe2158253a807565345/44626220832.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abd630192e9---baloxuzosufibubefuxebiwib.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/wejisilu.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074c3485c26f---negujokizawowegino.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3dc73bf99---66099094450.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79996eea16---53513292622.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/15780578727.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781e8615939---77114831165.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/90073109605.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/67930480988.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/29552043285.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e53fb88e0---tuxisufikowanu.pdfIn PDF document text
    • https://patc.fr/imagesfile/mipemegekireg.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072c233cf4d6---wunofop.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a802c698302---kuzapesemosogupemaziguv.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/386817256730828320d73c23c1c3bcff/79501879272.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/2321fd9ccc2ba546587a7cfb550562c8/30173677706.pdfIn PDF document text
    • http://industra.sk/userfiles/file/91342225532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=a+wagner+matinee+answersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF7E 10352 bytes
SHA-256: af59d87cf2f326011d6d5d76704498abea9319d23b2080c274b3505dcfdc5b52
font_01_sfnt_off000216eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x216EB 23500 bytes
SHA-256: 6a7a3844189ca3f8126f3f443069cb1d7b8b0dc8df556c4427e709ba2f4f04c4
font_02_sfnt_off00025070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25070 7144 bytes
SHA-256: 626add8f4b9a56072875669af8c75c3a82e2de25e8aa7f4897f295bc15bcdf6d
font_03_sfnt_off0002687a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2687A 16144 bytes
SHA-256: 7e35d1fd0f2ec36a3fc0c08f76f62a0e559a725ff8c5ed987745d6fa32a41d90
font_04_sfnt_off00027e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27E01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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