Malicious PDF — malware analysis report

Static analysis result for SHA-256 835675fb38cc0204…

MALICIOUS

PDF

76.9 KB Created: 2021-09-14 19:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 641f94b4dd9b9307833ee66adcf2972d SHA-1: 1ae78438017dd9131e62f30c0e478bb5c9fbf242 SHA-256: 835675fb38cc020486f06ff68a6b8af880cf4316157fe35cf26ff290ada3111e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'Password-protected archive lure' heuristic indicates that the document likely instructs users to obtain a password for a separate archive, a common tactic to bypass gateway security. ClamAV detection and ML classification further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=super+mario+3d+land+download+rom
    • https://atiksigorta.com/files/36017781475.pdf
    • http://topstec.com/d/files/49825447204.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c1116ef29dc9ed3e6f6c5d85fbbd6660/10723941575.pdf
    • http://svadbavmoskve.com/content/xuploadimages/file/7941840140.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9hu7rnfou2ejpsj844i6tl3p31/guruz.pdf
    • https://samuelben-horin.com/userfiles/file/polakepaluzafudaw.pdf
    • http://bettaletroom.com/file_media/file_image/file/22540701033.pdf
    • http://inphilong.com/upload/files/34146685917.pdf
    • http://laibros.com/ckeditor/userfiles/files/turikirisanivowuregiv.pdf
    • https://ottopianos.nl/files/482239977.pdf
    • https://ibextrail.com/editor-images/59510344362.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd70d84309---3979398646.pdf
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/rofagi.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/88e8e82ea8ecc4403e5304d9014225de/49345538514.pdf
    • https://radekslodkiewicz.pl/files/file/99962313768.pdf
    • http://anhhieu.vn/hinhanh/file/81431397683.pdf
    • http://1000projects.ru/upload_picture/file/tajis.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408046c78dd---26111528036.pdf
    • http://nationalherbo.com/userfiles/file/zibazulapelewasuxegedaz.pdf
    • https://ecoledesgourmets.com/userfiles/file/zerozidolovulokosere.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376ddd45aac---82066588456.pdf
    • https://firesystem.ro/imagini_ws/96268336052.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133c9644e63a---85949126182.pdf
    • http://crosswaysrecruitment.com/userfiles/file/zejaputokurulolopanik.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c86c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC86C 16792 bytes
font_01_sfnt_off0000e083.bin
701fbc78f792f2e2bfc7de9abf08a54b882da6c76d45854b082eb03c98990c04
pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 10720 bytes
font_02_sfnt_off0000f917.bin
98b78d32855074ce5254d172b5a8edca55daeb4b5972559b0aee25ddd5ff2b73
pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 17304 bytes