Malicious PDF — malware analysis report

Static analysis result for SHA-256 0819db33d60c9570…

MALICIOUS

PDF

85.2 KB Created: 2021-07-05 03:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e39823d4d99de2c1db53e2099a2e454c SHA-1: d88b369f8614ce68d7be3dd029ba39393c061fd0 SHA-256: 0819db33d60c9570f621ed1326364509e08f0c0b8b989b31afd243a6027982b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV and an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=opening+moves+in+chess+white
    • https://ajitcoatings.com/uploads/xetedof.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160762c3fe7c8b---medetodemunerelej.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/2hhtavjecobfufsal24leubf72/9513815837.pdf
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/fekowaxojog.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607865c4dc213---daxelowexe.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/p6sec8rvdctcjaaku5orccgd60/20996510991.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c89c8db2211e1c55a4de169dcba5190b/rekujimi.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072732255fac---93178711069.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080323b0bc61---rudakizimakotat.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8gnp89supj1eg4gg2bodg9c1nq/51497591689.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5f5e729aa---24350357258.pdf
    • https://promise-land.com/upload/file/puvejetepikapabujozoram.pdf
    • https://biovuspharma.net/userfiles/files/bupavapuxudibenadixezisem.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608323764b1c8---xujodelaw.pdf
    • http://hum-lucknow.org/test/fckeditor/file/43910783512.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/pajv9qu4lsar6vgd48603mattb/45671451543.pdf
    • http://newdimension.su/userfiles/file/61464611568.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/93706972801.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aefae347bc7---komopexapigujinefuma.pdf
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/xuxujabojiguzatejifelukan.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41b3ab8c2---31638748788.pdf
    • http://velo.hu/UserFiles//file/rutajebitulozetimunukivu.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vlq092e8r3autsp6b4a6qbhgcg/58885988786.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eadc.bin
62ece752bd0c7484086fa2d5916fbda57ed2893dbe96086e09de922639efc36d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 10692 bytes
font_01_sfnt_off00010349.bin
141695a01ce592c64b7db90644304fb8c0ab6d2996dd2da89a80cd1ae3fd26ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 17484 bytes
font_02_sfnt_off00012fbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBC 16792 bytes