Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5c27d6976721ba…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 13:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea7472368e25aa6d79161ac4c53dc9d8 SHA-1: 3351e0af07fc19047c5fee4d158d0f3b9fe27fc1 SHA-256: 5b5c27d6976721ba753f35a10b04eb33aae57cf2410b1c1e7525b4d5ff91870c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits malicious characteristics, including multiple external URIs and a heuristic flagging it as a clipboard command execution lure. The document likely aims to trick the user into copying and pasting commands into a shell, which would then execute a second-stage payload. The ML classifier strongly supports the malicious verdict, and ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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=download+android+for+raspberry+pi+4 PDF link annotation
    • http://www.alcera.ca/userfiles/file/27637471586.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/jopow.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/89678244827.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/kiseniw.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/51361528262.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210905120623.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137504ed1f6e---vinonumo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b1eeecfd---97570061303.pdfIn PDF document text
    • http://oodow.cn/upload/file/210910190127973679z9roa42v7mdt.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210912214403.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/vaduwemota.pdfIn PDF document text
    • http://metall-press.ru/files/goxijijajidipeguvibene.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/gozifudetabemotojutaw.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/4talocqc2v71vqp4uu1crlk71d/nuvafurezitagareradetuzu.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/2351818200.pdfIn PDF document text
    • https://simorgh.it/uploads/file/jojap.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c3aad349f---gadizivevuwara.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630973252/files/64060021316.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/vugesurunibuwonitidit.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/fijedofagezunoxoxaleger.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/16778946212.pdfIn PDF document text
    • https://masihpt1.com/contents/files/sevasukifek.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/2478123171.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/netefes.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141df86e4d27---3411413237.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_off0000d6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 17708 bytes
SHA-256: 5dd57edd88f970439e9170b9d128732ee90dde2e3c0c8ec054ef1b81d42b90a8
font_02_sfnt_off00011cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBA 10812 bytes
SHA-256: 4556e84511b440607ef74ee131994c8fdd6d8d33b7de0d265b0ce619a960f647

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