Malicious PDF — malware analysis report

Static analysis result for SHA-256 797d4a743fa1b0b5…

MALICIOUS

PDF

80.0 KB Created: 2021-06-22 15:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 873a60da0bc626d7ab5dfcc901858c53 SHA-1: 218bf1a9441e484340ccfd4f8bab5de701935120 SHA-256: 797d4a743fa1b0b5cabbb8f35b31ffe73d307b96b5407e4fc8109f5c1a36941f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, including those hosted on compromised CMS upload storage and disposable hosting, suggests an attempt to distribute malicious content. The 'Password-protected archive handoff' heuristic indicates a common tactic to evade gateway scanning, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://sgpeo.pl/users//file/xumuvikix.pdf
    • http://alarcon-v.com/editor_upload_image/file/latesufudukema.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608defdca34fd---62731833171.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758d1caa63d---87746957094.pdf
    • https://aterhesseg.com/up_image/file/widupevasasunosemixumeju.pdf
    • http://csptech.net/admin/userfiles/file/dutiruzajunepi.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/3d1515898de8a16ba1c95f45f3fad7ce/kamemivizotamodakut.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b57bc65735a---59682270427.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/netiregiw.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d45e08b28e---22136138064.pdf
    • http://fence-alarm.com/userfiles/files/woriso.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/f99b2de14d1c21bb4c6a2b5cbbe9b42a/20819946934.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/1a1320cfb2a597b80eca19ff03940d44/89323960059.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0689213b4d---newuginalewug.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/697b2b17cebc484ff9e286c4cbb16bd0/10671279490.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/3359962671.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/6c5905a9324e6f8edab2faad6725c18e/jixagijav.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/687f59cfd8fde462b55edc1c9545b8d0/22426251738.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nda+previous+question+paper
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed04.bin
ea2615a196761dc3469baa9ed7d5daf637d83879661966e6867da0b547e688b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 4960 bytes
font_01_sfnt_off0000fdf7.bin
e099bd2183a6f639886834a114249bdd6ff78e939851c15a8ebdb0164608b9ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 11244 bytes
font_02_sfnt_off00012426.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x12426 4324 bytes