Malicious PDF — malware analysis report

Static analysis result for SHA-256 1374cd22491f39ea…

MALICIOUS

PDF

72.6 KB Created: 2021-06-29 04:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d8ef2b6edec4705766fa60d91bb0d778 SHA-1: a8c338fdec3234dd779e7ba87fc5fdda24f1a3ef SHA-256: 1374cd22491f39ea97e9d55c81ae45671e73025b98b660d29e5b4090c9f8a390
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress upload directories, indicating a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with PDF-based phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ea8873f47---xijutojobutepujubakox.pdf In PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7414ec0491---37634210947.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e79af37766---zorizatitorane.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-25/20210625231933659653.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a444ea45d5d---82616597425.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/3741603822.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b76995c6d7b---fazet.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/pogibijaxeletasomum.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/64229953552.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607916a237e2e---63752007731.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/50563338318.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/8b2dc4e71d1bdf1b685a152065cf49c1/76259187875.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/6f31754d5ab593dff40359d4a013c001/72305039656.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/45323487222.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/legajisawujigovijodu.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/95410458585.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609478fd01cc5---30944903532.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d289eebf18---76440376229.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/9833c461454fa7d4b8d5885f336093c2/nudovumoviwaxivigelukumu.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/df035358c6f5a5b45ceb1aa93f36b007/55468380206.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bebe83400---didaf.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761b887f78b---tirefagagulopoza.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/logaxor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=georges+fish+and+chips+moePDF 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_off0000b974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB974 10960 bytes
SHA-256: 7234696e4777259c3e0de503f9a32ff5bfe3ecf5f08dd0a8c081c4d1b07c089d
font_01_sfnt_off0000d272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 16680 bytes
SHA-256: 16aca96bc742ed02bcdbd6653b2b19e4769202673dabd7a444ddb4c1d1296d08
font_02_sfnt_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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