Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd5c3388c98c6d3…

MALICIOUS

PDF

91.0 KB Created: 2021-07-19 02:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3c3c38737286a34b531c2a24f5e41f75 SHA-1: 6e74cff9e9e88a613e0fe3fbe898e10835585dc2 SHA-256: 2fd5c3388c98c6d34926de9ea26cdb2c8566c87a9032c4f4faebb8f93b1439d8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous URLs hosted on compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/20fde73bda9308b338f71725d41115e3/92610084180.pdf In PDF document text
    • https://thietkewebseo.com/webroot/img/files/fivulemejukedi.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/6efe014d2411a65ff335ef96ec6a4396/sutasujunejose.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/92aaeb1a614fd8592ff5857a3a052903/65651927571.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3c5ca63063f54cbfea63446fff743e8a/kusupenenuza.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/50916363789.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021053110103580554.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/kifijujozi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/bce07dfe7a559dd41bc0eb56260496f9/xuvonetanewivowabijazib.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/32067239c42f1e62bc1934ac3a8bde22/9323810803.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/wavenolupefujagerobikagut.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/xuguk.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ee30f1833---21217432359.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/78034052474.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/j0639aq8vnbrcku1urevju7qa3/mabakipuzinopimufe.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16089602deb4d5---vugizerukizerutovat.pdfIn PDF document text
    • https://citytrafik.nu/images/file/xanofalofuleripisoniruda.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/gemosade.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a432a141473---lafuj.pdfIn PDF document text
    • http://thepducphat.com/upload/files/dakosutefuna.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086fda6bab24---89546962369.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/28225591118.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8190f3ae95b37cae9449326f49b1bf95/firebavometuxunivemuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+link+image+in+gmailPDF 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_off00010430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 16808 bytes
SHA-256: a5cabf99de263730a3ad3971ca04a63a33230f30b82256b63bf5cd438353dce8
font_02_sfnt_off000147c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C5 10352 bytes
SHA-256: d5fb7c5ccca1f8949c33f74fe52af641bbf6166fbb1892b63657911b3a4dfdd4

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