Malicious PDF — malware analysis report

Static analysis result for SHA-256 78699698aa09c652…

MALICIOUS

PDF

88.5 KB Created: 2021-08-10 05:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19282fb6c9b6e50c48e25f1723385c05 SHA-1: 19d9112f91c917eb08a7e66311ca422c7570a3cf SHA-256: 78699698aa09c65296239570258c87b80215c073303724665c09c90fb1e807dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lure users into clicking malicious links. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, potentially leveraging spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://allytemp.ru/uplcv?utm_term=1987+yamaha+big+bear+350+service+manual PDF link annotation
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a44bcd52fb7---34324594766.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4ff1d655---turuzuposogelisikute.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/90379357642.pdfIn PDF document text
    • https://magerp.org/upload/files/jijevuvunopu.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/bfd0ba28cd91beb0a94aeaea23359cff/69835886171.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89902495777.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///34127565973.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/a2b8f6d3761cabcf961ede400b83b8d1/tevapavifuxeledun.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/kifipilotafasi.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead2768dc7---12150301926.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/48224055436.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/88918754055.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/13558342905.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/ritoxitumigafix.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/g7srim9ja5v09ft29cqt2jnmh7/68798465028.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/35586750552.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840697eeb76---verazomukomufogukugipu.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/18640553564.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/zorixemakexavevafiz.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/e6b089448cad047e15a0b42cb88d40c4/sowimotajenif.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/20514389036.pdfIn PDF document text
    • http://hchoanglong.vn/userfiles/file/lolux.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/09753c2454f465523432898e10acd6a0/tapipevituvopuneludaxor.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/eumgsfj66tj1bv3msvfrsn4t27/13484733264.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/zizosaburovebezozufurif.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_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B36 11688 bytes
SHA-256: eedd0fca868cb1e1cf16a7a17714e4ab0313b201444965305534c80746744a30
font_02_sfnt_off000126fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FB 16456 bytes
SHA-256: 26099b2c069f48aff63015d12d7b2bc2dc2074f3a517f4b8933cf2fe7dd7ef5f

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