Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b123814ce2be08e…

MALICIOUS

PDF

79.6 KB Created: 2021-07-01 17:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e9efc13347ee145223ac530157c6c7e2 SHA-1: 23930bbbca31628bd1896a87dc1f92bd956d738f SHA-256: 5b123814ce2be08edc19c76ca3733c7131c8642322fb55e156a8e08a2c80e582
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, particularly those hosted on compromised CMS platforms, are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3a477501---zeduwolikiru.pdf In PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/bc59885e2271f5f5273b44943ae1be14/20781426101.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/eb34529cf23ee167b9bc325c0f3b9fa0/43127433773.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/5dh30kq05rds7komvhtnc8jvpi/nepupixiwexiruxujexeware.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ajmfg38vpk0smhv59k7d64ujtf/67327191784.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/78353103641.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f493286c---38563060799.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/demizejotijig.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b371204d29b---58920642603.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/xovaxazo.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/zamamakizozupojad.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/subisozojadipiwin.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7e4fab7b3---52618665212.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8602ca393---dubedugevolomojo.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ppdp2b36fis8d40mecvbjbaac1/21283851623.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e16413c7508304dd3127e5ed3e2973a0/bonelibud.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/raxupotixolajusirom.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/legotudova.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///wotoxexid.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/b8d1aec6cb1bdceb320e3b79c9afc7f8/25276145526.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b71b3a862f450076e9a0ab549124cda9/10328368910.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/24796916954.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62837e7aa---59881342311.pdfIn PDF document text
    • http://chinazzjx.com/d/files/lanurazege.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a03e6a6ed9---6154898154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tracy+chapman+song+give+me+one+reasonPDF 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_off0000d139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD139 18188 bytes
SHA-256: 76948b95abffb87d154b7c40993706643e8c6be4aa0fa83abc1a7bb12a904aa1
font_01_sfnt_off0001000c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11823 10820 bytes
SHA-256: 302b92790ed97ce429910da05ea96111e7b29c5ecb304e9e9da21374aa698a5f