Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0294b2b8bd5dfe6…

MALICIOUS

PDF

87.0 KB Created: 2021-07-14 05:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c5f0b1efcb265bb0aa8559dd828a430f SHA-1: 378ed53acf11ec9f62e1288aec55255168a12136 SHA-256: a0294b2b8bd5dfe6a5c394201483b7a5d02564f7ec5066cb566f6efb1ce0f695
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised CMS upload directories and disposable hosting, indicating a likely phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160763a92c6722---belesagiz.pdf In PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/mopifoduturikisiwot.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160814de4b2b8e---bavapoduvu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac6b2e2762---wasavete.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/649c7e33758fd89e5905b1855bc4e5cc/butileru.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/09mslitc3uf2astidi574qsbn7/gazuzet.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608594ba8b97c---55910528631.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/zufajosowox.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/bazuve.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/fewiwimagelagizajemata.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e463bbd7cabd0a68d8b30c7fd1f5ffe2/kidogoguna.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/2fd47bc2e16250419f7b5de8a3ddb897/rekofuturojevilixixujim.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/fonojefenuketarizakagorof.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4ae2d4a257ff74ad6687adbeb88757b4/32397564703.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609201dec4d90---sunetamupisowiroj.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/36710679070.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607077f45c29d---zupezoxezisel.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/a7dc9c07eb28ee8e08be42e90e57b9e5/likunawetiz.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/13513301583.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/176121c39158f5418c89e173eed88fb2/33955756796.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/49748531881.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/1de762e4f2d64b54786c457f90c8e0df/25931497034.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607cf6b63b9d9---70048556516.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/musekedodabadoferamerak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tamilrockers+new+sitePDF 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_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 17688 bytes
SHA-256: 53a9d9a7efcc7ab95ba08ff4d4220b509cb22e57e7e908854df51f4cf5b32e4c
font_01_sfnt_off00011d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13540 10532 bytes
SHA-256: f92dd3464d54b81c1cd1a094357dad09d6a7e07c5cb43521f9b8a9751c76d527

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