Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc14425741cb17b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 14:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a34eafd530d8a32685d0cce800b32e0c SHA-1: b7d5432c3ac94c1d8c74611602305315fb2caf64 SHA-256: 5cc14425741cb17b184a4c2dc280e36740676fb9c5e12c84c72a2dd7fde302e1
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF document exhibits malicious behavior through multiple heuristics, including a ML classifier flagging it as malicious and ClamAV detection. It employs social engineering tactics by luring users to recover secrets or private keys and instructs them to copy/paste content into command-line interfaces, indicating an attempt to steal credentials or sensitive data. The document also contains numerous external URIs, suggesting it may be part of a larger phishing or credential harvesting operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://pixomot.ru/uplcv?utm_term=smtp+virtual+server+office+365 PDF link annotation
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/33242806196.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/85217930627.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/vosenobekewij.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/dopenipefajevotak.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/56468391796.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/98005221927.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/95269368013.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/tigokenikagipisazomu.pdfIn PDF document text
    • https://ottopianos.nl/files/gavumowexotezik.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/37407507130.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/82910934588.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/38611696918.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a83b6dfd1d---24534245849.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613026c5a3b84---tonuxitakinag.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161407aea1ec9f---87201574089.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/66397350947.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/ludodugadevewenujamafezi.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/86366823823.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed0b7d008f---21635043837.pdfIn PDF document text
    • https://masukpt2.com/contents/files/juwajabeduduzusiwub.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/duzesekib.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/rapoxapukilaxojazesam.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/33739844981.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136f697e31ec---kokizelazab.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_off0000d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 11252 bytes
SHA-256: 36155eed2a20c5330b794c29cebb9ea810b86546a79204456014b2bb7612b3c1
font_01_sfnt_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 18940 bytes
SHA-256: 8f552851067ca8204d847a74b58951e217d2af31ea6ab99480144ff74d3fc9d0

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