Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8da2f1d26dc0cd…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 05:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0989922949f705a4d8a1e3a0d835283b SHA-1: 8fd651770b79d47acb717d2d3588f4c1d06f28ba SHA-256: cd8da2f1d26dc0cd45c9bb896cdb196210d86d7f87ec03f0bd3b71cb2623e8c3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, forming a link farm. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document text may contain obfuscated commands or paths, such as 'cmd.com/data/files/vaxuwofifinabe.pdf', indicating an attempt to execute or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.c-l-r-p.com/admin/ckfinder/userfiles/files/kidonewetavekavul.pdf In PDF document text
    • http://nsdadventist.org/FCKData/file/gejavezesukovagagi.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/jezaxivorafotobasafegav.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/76a9fbf2153014314d13512d0d619c1d/69222967909.pdfIn PDF document text
    • http://qdcmd.com/data/files/vaxuwofifinabe.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/0e74824fcb02ec9a1975ae1be26c97cf/86783709806.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16226579172731.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/lonoxof.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/jilekotirezoxedupufudexo.pdfIn PDF document text
    • http://aimic.com/userfiles/file/gomavufuxim.pdfIn PDF document text
    • http://teresachild.com/upload/files/94444498711.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/petunaxiwamod.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/febepetubimusako.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a897b1d3616---punojolorejevobuzujolij.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/dd1dc0341eb228bbd795f406bf0c97aa/timipoxek.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f88f68454---wodimevawel.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7d46353f0---63883984319.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/92730791989.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb343d98a7---28955058139.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076cd274ce50---xusefalukevelepufuzad.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/wixetonisamoxudike.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/paromufajavuviletotofivoj.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/gelenefeniwizonevajowuza.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/96901601496.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/37293335635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=stomach+pain+and+gasPDF 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_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 10756 bytes
SHA-256: 7b0f969541e19c96d960d186f0070dfd853e73fbe0e20880060fe4bea2432fb1
font_01_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B22 16768 bytes
SHA-256: 85a22dd6eda47b23d3b5d6f2a874dfe52683b38654fc6b077877d68484ddbe22

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