Malicious PDF — malware analysis report

Static analysis result for SHA-256 087b3e4e5d54804f…

MALICIOUS

PDF

85.8 KB Created: 2021-09-02 07:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7091740ab83454d6ce497b60f6a0d239 SHA-1: d5ddbcaa4d54745930ee7e85cc2e7c6bad2adbaf SHA-256: 087b3e4e5d54804f536d042c5909825ad2fedeb645b8b11f99d7895495738409
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or SEO abuse. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content or exploit compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://archism.ru/uplcv?utm_term=cbse+class+10+chemistry+chapter+1+ncert+solutions PDF link annotation
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/b8krude6qbo5n4suee8dbks4cu/pisado.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/7205895737.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/07e4abef7d931a11c41cef5cb00a6b52/7248764846.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ca8ab937ed6c9137434573bdf5ca7432/moxulukezajet.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/24143055994.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/rajageribidimizelixu.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/javejijabuxigolivid.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/fbd334fc8e13047f3274ffffcd9763ac/jexumezosagakava.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/87971425147.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0a21c8de9cc319795390a99eda1dd92d/88562318762.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/literovevapu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e032d10c5e5---46363099373.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/zokuladatelusefa.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/5c283cc9d246963d93122c6e490f5c92/88960472453.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124ba90636e6---88159261266.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af8641bf40a---sosirasisow.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f540f70918---12692176778.pdfIn PDF document text
    • https://unosms.us/userfiles/file/dovugerazewovibalunob.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210629134737_911l4z.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210803044207.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_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 19216 bytes
SHA-256: 7f531621aef4a01c22e48c203c600860b769ffa9cb195d6a940a3649ef085a9a
font_01_sfnt_off0001176e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F85 11196 bytes
SHA-256: dc9cb7ace27bd5b1b0b494e36773cc9ddd2c965968c3c66cc9458b27d08d7328

Open this report in the interactive analyzer, or submit your own file for analysis.