Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81d02439d5b14c1…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 04:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 64428cfe10258f7de91d7974890bab65 SHA-1: d2ebb928e7bbd8c1d795bd7efab4b55980e7503e SHA-256: c81d02439d5b14c119e6a5c8aa90823748c7f8310988354b469c81ea20327cb7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including a ML classifier flagging it as malicious and ClamAV detecting it as a phishing trojan. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic strongly suggests the document instructs users to copy and paste commands into a shell, a common technique for executing malware. The presence of numerous external URLs, many hosted on compromised or disposable domains, further supports a malicious download or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=windows+10+home+iso+file+download PDF link annotation
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f3bb566686f8fe89b6d908c218d68996/12122360355.pdfIn PDF document text
    • http://mariancozma.com/_user/file/vopabomafizozutebuje.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/5847903351.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/wiwelagixapodetexaroto.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/xaropopesetobovukibaz.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/nupik.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138da941b684---85845335766.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/detafosapaxuvosifujodoli.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/tafamona.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/zolofovidolumopawuvenu.pdfIn PDF document text
    • http://kim-clark.ru/files/file/95571219146.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/raredonogizovuliwitodubi.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613BC9661D835.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161417075702ae---63513843451.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/94952934890.pdfIn PDF document text
    • http://ruresept.ru/files/file/binagunigifos.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5ae7ada4704e529e112fe945e2ed7dc0/60933118637.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/95430062721.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/fikexexovudidumudenepiko.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161353088c2a9f---27580741225.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/nelilumid.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/memutapudewuzizibokaxok.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_off0000dfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 10672 bytes
SHA-256: 931b285f42c2385a8ec125543820d40c75434950d6729343d4b564074f74ace7
font_02_sfnt_off00011029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11029 18904 bytes
SHA-256: 291cd46937967a8fd4584e1f5f14491a3aa421fe8a1bee66d78e661e83a8136a

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