Malicious PDF — malware analysis report

Static analysis result for SHA-256 407d7c832f29e8c7…

MALICIOUS

PDF

74.5 KB Created: 2021-09-19 02:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd26182875b97692f6034ecb2d966029 SHA-1: 3e61236ebacefda591e2c2167df620e8816c06a9 SHA-256: 407d7c832f29e8c7b2e00335a811d41faadf2a6cf4b80bbae40cd6209aafcf59
164 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external links, including links to compromised CMS upload storage and disposable hosting, suggesting it is used to redirect users to malicious sites. The primary function appears to be redirecting users via these links, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=death+chase+2+on+friv PDF link annotation
    • https://immo-macedo.lu/userfiles/files/83451371279.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0261420ed---83736227567.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/fevedawigujajuserorugi.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8459723b8---64149286554.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/gowoxinejunefuzi.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/25233828219.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/kifowazagi.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/34692248362.pdfIn PDF document text
    • http://hexindechem.com/upload/files/fonuxijuribetif.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-18/20210918010806544641.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/79490933142.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/raxivowasutinafujej.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/15435540084.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/mubexako.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/55743848173.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/87073055858.pdfIn PDF document text
    • http://school15-tyumen.ru/f/65025914099.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/31963749766.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/samalaxiliranogifez.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/loxepipoboveragurefuj.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161319a6962c52---76829750989.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/wonedujagupupikukarug.pdfIn PDF document text
    • http://lex.tj/img/file/45784952017.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/78215178123.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/81918446544.pdfIn PDF document text
    • 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_off0000c134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94B 10576 bytes
SHA-256: f0e186fa6cbfa254b125e71c272fb67d41cf5fd603af9625f896cf952dadcb33
font_02_sfnt_off0000f17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 16816 bytes
SHA-256: da25a3c1ca5fb8dfd2397e02123be3aa2213cf3fa98e63a32e42a9de528823bc

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