Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea55b3c44b1be64…

MALICIOUS

PDF

83.3 KB Created: 2021-08-18 04:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d386b88f597071a792c144db5f479178 SHA-1: be512d13c4f44bc985d23fd7cf8406ec8a287659 SHA-256: fea55b3c44b1be643ef35b78b53b9483ab24910d27b54c683884111f28bfcbc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs pointing to compromised websites, many of which are hosted on disposable domains or utilize WordPress plugin vulnerabilities for file uploads. The primary attack pattern appears to be directing users to these compromised sites, likely for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=google+doc+monthly+calendar+template+2020 PDF link annotation
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/clg7g5h4beafnju6lfqc8sl25o/nulosinurelowikunatej.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/zifivurabed.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/19/file/20210519_153247_124.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/b70220746ed2661cb1e9fa3cac0aed9f/54060437544.pdfIn PDF document text
    • https://begili.com/uploads/image/files/59885288387.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8bce47b0e---josuxojuxupekamu.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/v661dct57uggovuro2k7amcdra/bagowawam.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/d75c0b2000684302c16dcb26708ef625/devuxezuno.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b56a10ff0---tupedivulobabowatujik.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/61265457901.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607488a32be5f---tonitojepexigujag.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3e7rgal40k1lpgbs5kemle6tik/penibatexi.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/mabedamarowomivujarekis.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/pazikekitugovuno.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/lutuz.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66664d4d6---21025556934.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/demuralegitoda.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e2197d27932---74841077017.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33186d499d---mirofejadukuzedigetidul.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/34251761162.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/ronetafovurepuba.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b36a66bda5d8ee8f4794fa7a8016cf18/20105685847.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_off0000e302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 16276 bytes
SHA-256: 6b769fcc8615a85c1c63eb131dec21479e41a4c99a07bb2c2a258374ec2886e1
font_01_sfnt_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001253f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253F 11096 bytes
SHA-256: 39136bed389ee725fabdb3d1252c74398b7fe486759cc9dd1b0126eec3f86a3f

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