Malicious PDF — malware analysis report

Static analysis result for SHA-256 58327cb0a96bb446…

MALICIOUS

PDF

95.1 KB Created: 2021-09-04 23:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4227a84b44740d4b72a39b927dce5a4 SHA-1: 0c41fd43103707ed0cefb552c31c325dd60edb32 SHA-256: 58327cb0a96bb446d1ced452d5fbfb15849bd5b5dbf319effef2c3d3de4cf3e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including some hosted on compromised WordPress upload directories. The presence of these links suggests an attempt to direct users to malicious or compromised sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://rencontres-icare.org/userfiles/file/52396880837.pdf In PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ba6fdc4d8---29673437030.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/31131859047.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/litovobav.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/582878509.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/19301638451.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/garirofejabibirebakuw.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/4kve0rfg8gd33iumcuklpk6eb2/javajelewob.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ef806a012---53731549167.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/rikuku.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbad7a4d12---dafukapofomet.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/nukasusevutofubiwiviri.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/138b1ed15759a90750414f416e7e48de/xosoxadadegavegijuletiw.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/53c119f0de92739fb02e763334f3885d/lutanixajevorawufo.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/41995315832.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/sofagajafuwuzipipiko.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/50031191851.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/1816053979.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/23478b3d68d3983da0a9f4da947d0a12/xurararifinaruvigeza.pdfIn PDF document text
    • http://patroha.hu/file/75698045800.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/80293923852.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/cef6d61ea515da8a2ed911341b73ee8e/37853208012.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608530eada103---40904460969.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/67d6d97bf6cof9e76s87rdnmu1/46297812033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=manual+para+ujieres+catolicosPDF 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_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 21320 bytes
SHA-256: 84d759d02698169f50044921f61f91016fbbf02f6215b118ddedb00b7344232c
font_01_sfnt_off00013cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154ED 10592 bytes
SHA-256: d8720ad520f9d68a2682c8aad74d614ffa7abe9f54e720f40f42fbdce9ead9d2

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