Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19eac44db388fc7…

MALICIOUS

PDF

87.9 KB Created: 2021-07-13 21:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f5770d1ec4c0d6c0363fbd644b675a48 SHA-1: 126260c7b195035d930d513af7affb8bd2b99aca SHA-256: f19eac44db388fc70148d7b25773f851492135a1f72d760ab6ab2ff54072a413
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 file contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://smidgel.ru/uplcv?utm_term=problems+in+physics+by+abhay+kumar+singh+pdf+free+download PDF link annotation
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/mk8peda6o1bqlf094c5q7one67/sofazopofidabaxanaworud.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/9feda88f128726ad0f37ad7e5902fc9f/wukewureloz.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/15912053732.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/svscnc6ba1p407gglf287h32c1/vowavadila.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b16d73bd28---53981440762.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/09b7ddb5152b081b3b4b043e25691bf7/xuzojuridugeloribuvusil.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/55897188438.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/zixejufuzikuxemono.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/45003113755.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/derumasexiwadaxolej.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/87225521564.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88f4b3c321---51004172323.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/98a177f1c151811dc8405d3f122e8dac/vuwobixo.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/sokesifuvulenipum.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c9101b2c0920de038facde869100c4ec/19247317046.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/12bc3f55793ac63782c2065f52eeeea6/89373084514.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/49473601623.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29i9fsnql6i3mthp2v64ke3d95/xonem.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/13752585806.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a57a76160a---bozeza.pdfIn PDF document text
    • http://islandpointfl.com/userimages/vaxufipow.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce22228b637---62740647452.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/fe046a9efd2ccadf7c1a54ffd7a952f9/56025418709.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_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 17568 bytes
SHA-256: 999f15e9d714f572e018bac71783077c9b688b430db9c1657630c9f5334aaf5b
font_01_sfnt_off00011d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001357d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357D 11500 bytes
SHA-256: f6eaf2769c8e24102e43ea05e515fa579d5f40955b7a74e90f3d9a3b13d7a0e9

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