Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed3f720b29b03d4…

MALICIOUS

PDF

79.3 KB Created: 2021-05-03 23:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddfe0839d0125cdad82da056eaceb6f9 SHA-1: 7c9ebb0a6582155f93c4f693fc3145d015e591fd SHA-256: 7ed3f720b29b03d49e138219fd184a7c4c844e976b482f50fa3956dc81247746
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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 http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa8b4e4044---50116509130.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e61ef7cb3ae400e749f0324bd8d9cc3e/navejumukenepotesa.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/6d4c9dec6045d2345804497a21c860a2/25680372507.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d0021f072---tijebuludowopiwu.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ljt5ugmc4q7oq0hnp5fqn42cm0/54936056045.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/393c006df26128a0dbe1c8c5f57c2cc7/62497049613.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/4870af52eb3ccdda4e08a1328e0e3964/fisen.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8b4a46661---ludekerevakabulabekujeki.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/e1b4888bf714122b99091992c0488434/44318983890.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16072bfe292e5f---kuvodizolodidanixajiz.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/862f61fc37a217bf2192747f72807537/jiwetijareb.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/1rpbklailrv5nrnok0a95bgbkr/7195041631.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607839790eb84---45803321192.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0dad0b017---ratuturepo.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2766e60f---belez.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3eef092a---regijelafexi.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2e57e8fa85a43f690432a5eef7aa67aa/varedotoda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=aditya+birla+mutual+fund+nominee+addition+form
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d8.bin
ed98d2505764eb87f57eb1e03952ddf76ce2b31ba618c68f296599297ee0b7ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 4988 bytes
font_01_sfnt_off000104b9.bin
ba630ddecbfb2127fe3f2fc236ed14501e5230858a92de782d0c919c5816ec29
pdf-font-stream PDF embedded font (sfnt) at offset 0x104B9 10964 bytes
font_02_sfnt_off00012a0b.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0B 4324 bytes