Malicious PDF — malware analysis report

Static analysis result for SHA-256 0422e293987a5e96…

MALICIOUS

PDF

123.4 KB Created: 2021-09-04 19:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d496c465de4b8da0b31ecec2d51e4b0b SHA-1: 3a0a6d227273238f222684cff0efa7e2bfb00bc1 SHA-256: 0422e293987a5e9678c1a35d4f06bc8e022da1d11807699aad9c661b11e3bef7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. 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 suggests the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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://laborke.ru/uplcv?utm_term=interpreting+dreams+biblically+pdf PDF link annotation
    • http://akicgiyim.com/userfiles/file/nigikuguminewarepumot.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/751152e4191c9ec9382f35987f28322d/89838627642.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/zumoxofidelokeziwuge.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/31486234306.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f9e0a67680675d141c9e6abb0eab9ead/kosuf.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/wuvirabopurizufelijukida.pdfIn PDF document text
    • http://bvsaigonbinhduong.com/uploads/files/68333236865.pdfIn PDF document text
    • https://bem-sa.com/img/file/65574121534.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/91190917601.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/9718223618.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/21213540860.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/fitad.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/lafokuwa.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/405252dff2882c957463d997bd6674dc/83383558001.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/fakamomibetod.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/xabekulobivu.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/vodaxutudiwalofi.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/56891425404.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/fajukutoligifesigebovem.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/67066231141.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/ruzerujejigipat.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/sukobobefejur.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/mavamogegazugasubod.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a07c31720---97737371530.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/vajoxibibenujejigijewake.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/65198522534.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_off000174c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CD9 21740 bytes
SHA-256: ffc7dc6bcda17e64515a2776772a046ee6474cd6e3551d4b520247776a8586da
font_02_sfnt_off0001c61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C61A 11048 bytes
SHA-256: f03c5960c30c1c67b3aa6925eaaaacedce682fd1147c0de2bf93d80eae6ffd58

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