Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c8b6f3cdc297b5…

MALICIOUS

PDF

73.9 KB Created: 2021-09-16 21:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 57ddd368f647c95e5d4d5a5b0bda39e0 SHA-1: 007d15c9987d4067ba75b028ae0e9c46b5e36245 SHA-256: f4c8b6f3cdc297b5d3e05a841938f79445fc24d7771f7fbb6c77659ca5740e58
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pixomot.ru/uplcv?utm_term=how+to+send+json+object+in+retrofit+android PDF link annotation
    • http://www.morrisjones.co.uk/EditorImages/file/farujenovimolebevokope.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/40433668600.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/c37a72adfda09230d69132b047146881/wenexa.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/58678540708.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e60e0b6c8a---91196282031.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210910192523.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1d1414d14---35728338919.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ecc1c01e584ac2d83e6de759fd613a82/36880404107.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c070e7822f---basumibifa.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/60891896879.pdfIn PDF document text
    • http://elitk.ru/_files/lopozexezigeroz.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c66ac563c3---zizefeju.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/64673160505.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/jeropev.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/wonawedikok.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/73890303617.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/fejisig.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/magajugaler.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/34251826144.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16130af575fbef---galuwakigezodasipe.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/fimipizavajariwotezixeb.pdfIn PDF document text
    • 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_off0000bb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB22 17536 bytes
SHA-256: 9a14e175c2998a6392860f8a299fa4d2356e470083b2fab152b4fcc2668e944d
font_01_sfnt_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 10768 bytes
SHA-256: 8cef73ba51d44dbaa6d323ec3c43ec7155920ec3d29dfb7baacc168c988a219a
font_02_sfnt_off000101cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1