Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7ddaf49487510a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 09:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e18ab73280ff70317590c7949d55f075 SHA-1: 4dbe4bbe2d3f31d343d2612cdd52d1ed4c2faf7d SHA-256: 3f7ddaf49487510a76781a79245ed20b68d5dad61dff42eb9557521502de14bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.jobsincrete.gr/images/_user_na/file/45818203049.pdf In PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d5fc2eb93ad318c9c9d485a2108c0745/pasunexaganowadoxapax.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606eecd5db152---50982027607.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/wulijodojizefidizofun.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfe8caf436---30940392324.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/mesisajififazelaw.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/31572211181.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/rivupubuvigidaso.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/rijol.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/wawodoxoz.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a07739230---jakanupilukurixo.pdfIn PDF document text
    • http://tano-cable.com/d/files/32646511665.pdfIn PDF document text
    • http://scarpatti.com/files/91563475124.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/cd9a9e9287ed659b326c3e6acdd968ec/83715037752.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad0d0ed976---guporudata.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f4092a7aa---dipaxafazenenubamow.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/dojaxudigeketivaferu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108eaac6df7f---mipezomakitajoxeru.pdfIn PDF document text
    • http://afslab.asia/upload/files/71515429850.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/40095827ce5caa9a5829fbcadc2e7b19/27221362301.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dee88f0785---95636952945.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/19817544497.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/9712432694.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16099b44edd882---70753632990.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/wivowuxixofinixepimebaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ludovico+einaudi+i+giorni+sheet+music+pdf+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_off0000d82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82C 18396 bytes
SHA-256: b758c3b231d8c42ef765834a835479fd856a0cfa7beea89eb59e9499117f3f3a
font_01_sfnt_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 11144 bytes
SHA-256: 814bccc67a80ab415f3e7121ed5198c3fb6ffe4dbf0209f9f1d7bace7c8f19cc
font_02_sfnt_off00012206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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