Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af33bb1e41ee111…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 23:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 796e63eba89ab0afe2f42bdc03a70133 SHA-1: b890d27dde1aead08dad64f23a1e0f722156b31f SHA-256: 4af33bb1e41ee111f9bb536e1cde69e09caf245c1c0bdc40c373f2c6c205360b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cabc6a4649---32925331582.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873c3760904---20580110791.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162414880788.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/46365078706.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/botakarozeb.pdfIn PDF document text
    • https://go2germany.ru/files/file/67838899571.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/25dd791b8a32d6f038493bba405e5b05/47331576263.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6813b8799ab892a3d2fcfa591bb75242/lowopoxuxafatu.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/eb1ebdc4bd96ceec44af2db8d72742ac/69027117475.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7720e4e06---wiranalobimigikutive.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/8c69f0ac209233d51b2cdeae5d0c8740/1051895597.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c4c281716---dexesoselikibuvaruwejowu.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/18377682419.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/vexinojegu.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/vejawewib.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/79450517832.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e218cbb0e---wozarovujejewopamedexube.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/55921260774.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/97828765817.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/15783753568.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/gutazevixekulexonanoza.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff954b8b0a---47629621794.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/53239071097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=concent+meaning+in+tamilPDF link annotation
    • 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_off0000d4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AE 24704 bytes
SHA-256: bd64faa1dbd09078fd7d2b0b0297e20984a268a2fbe7e8d9b86d1603837b4008
font_01_sfnt_off00011378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11378 10336 bytes
SHA-256: 4163e6852593edd5a4d70f86f3fc0f859ad5a50892d557637229509c4ba0f08d
font_02_sfnt_off00012ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1