Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49e4e9e87cd4b6c…

MALICIOUS

PDF

89.5 KB Created: 2021-08-20 15:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77fd99b9ce6607882115406638d5bed2 SHA-1: 6105dece7a7b2e77ef25cd4cdf44bff20059865a SHA-256: b49e4e9e87cd4b6c92849f47bcfe2595ee24a4ad11dc6d6b48f21c1488f3a5c1
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information T1553.005 Antivirus Software Disabled

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. Heuristics indicate the document attempts to lure users into disabling security software and executing commands by instructing them to copy and paste content into a shell. This behavior strongly suggests the PDF is designed to facilitate the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://crewmak.ru/uplcv?utm_term=batch+file+programming+hacker+style+pdf PDF link annotation
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/5femdjbr31r5r18g74fdfbdcjr/9991875353.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/zukutaxowuza.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/ebdf906d23a14d7fe24c22fa3e07ae1b/53230719556.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160913ef276990---sevesezatanaluxapat.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/69286739721.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/6560541441.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6373f7e67f---ruzub.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/bapijudokulomepeliruxifop.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/69761971446.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/50165026347.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/33300408554.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/55074299313.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/xozazugeni.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/75327376921.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/bq14pc9qtqbg3168soe60kgeg2/gobebibet.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/linotalovazopebivusudivad.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/42698694930.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/3pn4g6d0rqsr6age2rgo7ksqs0/fixipab.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/wunarabinovumagimuga.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/07/08/93159877198.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/woxude.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/nakexazajinapasoremim.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/87193845238.pdfIn PDF document text
    • http://peoplefoster.com/pliki/bitasebol.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/misapekep.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 18328 bytes
SHA-256: a10591e3a5fe680e4f7b015429a12b806981625804b552efb7e9b87958de925e
font_02_sfnt_off00012236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12236 11324 bytes
SHA-256: 01e7a7712a93aa5655eced52e4965c20ef9caedfb452080cce018fd731542037
font_03_sfnt_off00013c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7F 17368 bytes
SHA-256: b2cdadbeb767ab4dfa9ba570d8aa160b81b09cac099daa145311826d0a803445

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