Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f44690348ca293…

MALICIOUS

PDF

82.5 KB Created: 2021-08-20 08:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 06ea3e458af8dcc92c508bbb506a6315 SHA-1: d5b315d4ebcff898f48101fdea2e8a6b23dee361 SHA-256: 40f44690348ca2936181ad1bb8526d0e29e818cc6237f4da189fb0c6b9f95603
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 0.9990

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.syah.org/wp-content/plugins/super-forms/uploads/php/files/7f29d579942d36ceff3fd0ab143415b1/xetomev.pdf In PDF document text
    • http://krukaiart.com/userfiles/files/24906594648.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608732342398c---gapedaxu.pdfIn PDF document text
    • https://edusfera.pl/upload/file/woweresevaxuzomorunimugu.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/logetozafi.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/9043420680.pdfIn PDF document text
    • https://securitydm.com/slicice/file/jozinuraxezimodexata.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/bae4dc2533cc1216a257cf7f504a4cbe/21046863511.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083421186bab---zaxikaxuxofugavemur.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ptl31fth5qti009ofmf91v4smb/11382788802.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/23l2a1tjri8h4ta9hia7bl866u/pefixawopi.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210720_139F263796857AB5.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/novode.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085eedbebaef---velufuwevumewasililewog.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/0ous6q2tlfp7mlh4dfuqb64fa6/81236679953.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/45ead3b8729b062ef1e38b3d844c7a49/34016001699.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9edecd5f---nologekuruwevox.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/8290ad6af8f4205ea545156fc7e61864/tuvojunubibelaf.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bce24623135---wotolifafifoji.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/epgnsur5ie495g595l22ms4dm4/34918645103.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/gatozuguxipete.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608470186a0cb---kotefamozotugosafaluzit.pdfIn PDF document text
    • https://ip-pharma.net/data/files/rifiveloseruf.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/idhvo3lu0lc63nungbv904bv21/58011055017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gta+3+free+download+for+pc+setup+exe+windows+7PDF 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_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 11160 bytes
SHA-256: 22cc82a13bddcce5824cdc817681eba66dbafb3011b698d4654120ebab2597bb
font_01_sfnt_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 16740 bytes
SHA-256: 45b5a068c0ff335fe8f2c41854f1b57b3725c94f6a60d810bde0c02eade72369
font_02_sfnt_off00012370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1