Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc7686cda1e88ef…

MALICIOUS

PDF

75.8 KB Created: 2021-09-04 16:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b67b74fd0d508fd452da8980e1744489 SHA-1: 11ec939c516af5a25d80b6f528122edf43913681 SHA-256: afc7686cda1e88ef7fd38ad6ae946d9928b1e76b371920d052c8ee57e6c7c6e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous disposable domains and compromised WordPress uploads, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zae.me/datafiles/file/37060671437.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/557e410532be0f48b1f0fd1362709b39/fumuvuj.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/86924937118.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/tegipabuwibitulesegal.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160e946771a3af---15662309155.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec45ceaf51c---gawunewiwadaz.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/3907617102.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/gikimibirasanuvama.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/kimeli.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/2706692483.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8889fbeb26---fapunasurekegen.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/48908885845.pdfIn PDF document text
    • https://guijek.com/userfiles/file/62759106505.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16071d111be998---31362438937.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160984b606278f---5393748826.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/dcmnutsc73gtkbl8notvun9b47/64836260267.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6fb8a7081a7dd02c7085f2e12a4dd4dc/68367330502.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/lujisenijamovokorojud.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/laxexuwixuzuwugig.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/jivixirulirawuze.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/53787912809.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161273cc50a11f---koseredasaluw.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/newawepigimab.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/mr4q471oivrfmshavn9btvodck/wisokeduguxewesazerotoje.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/wovipuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=zurn+roof+drains+pdfPDF 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_off0000c3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C3 10276 bytes
SHA-256: d78e95694b81840605fc7fa566d68bfe48d586df813872b1a816a9068eca6483
font_01_sfnt_off0000daf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF4 17984 bytes
SHA-256: c26cdd60722c2f5de2871be4d38c93731b5bd460a549433a35efc4b5dae39aa2
font_02_sfnt_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1