Malicious PDF — malware analysis report

Static analysis result for SHA-256 7386fd2848df2876…

MALICIOUS

PDF

75.8 KB Created: 2021-06-29 10:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 216bd4d7e20dee3cf9ae2843803ccba7 SHA-1: fe0d622567c26160330be41a312f489d6407ba99 SHA-256: 7386fd2848df2876a4d180e82307ef882ab91fb99911f5fdcf7ece129f032ac5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports this assessment.

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://cructi.ru/uplcv?utm_term=online+play+battle+royale+games PDF link annotation
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f1a2ece3e---64829650225.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094c8067d610---45349147236.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c02b3064---52990590963.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe188c94f2---73563068948.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/b4qf2i28ra0a3eim3gk6o0befe/vorivibubujapi.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/2021525102522.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/36660422436.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/wefesopi.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/3dut4g6a4jutlp4t0iudjok5vj/kagefi.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f39e44e462---sulazokim.pdfIn PDF document text
    • https://watertorens.nluserfiles/file/88760545159.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fbb6696e1---mafabosikelutenamorixu.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/bixatorokesugiworem.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609424a3da73f---gexomeku.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1f111af13---59860761671.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/lurisoxisosep.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608805a396774---76403859510.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899b5751c16---33369982888.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5e7d96768---nazuvepitizebupugekadaziw.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/rutetopovimunuruga.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/89288133629.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_off0000c642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC642 16560 bytes
SHA-256: 565eaac1de2cecfc4c7049cf4b657b3a6869a5174edb2ada7ed6778d235b5dab
font_01_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 10872 bytes
SHA-256: 2816d177720962719a86060146c297d73d55c68ccad640ae9500dd9330a68712
font_02_sfnt_off000109fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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