Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ebfa863e3cce16…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 22:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 691d0a6f82161b2b692a6bb81ba60a12 SHA-1: 2e47193760275e41e7c2652f9405c8c247bc739f SHA-256: d6ebfa863e3cce1697895707632ab285703e0d5620d8098738171fac5be248c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of external URI heuristics and link farm indicators strongly suggests a malicious intent to redirect users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://queure.ru/uplcv?utm_term=download+imo+free+video+calls+and+chat+for+android PDF link annotation
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fb351033432c377d18d86697c49c07c7/delajasegeka.pdfIn PDF document text
    • http://calisnt.com/uploads/files/kixixebirafurubujepef.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/sixifukasadasosikajodej.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/b7d700e26e0e706321e8879546beb7a3/kuzasikuziruke.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/robudijawaj.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/judidegukefusovafobewi.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5477376cfbc518814e731d0f4cc2df3a/kutokopesobefelebune.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/22329022139.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210921032522.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/puzuxototado.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/88268676104.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/nepanogipoxi.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/tijijotoku.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614d51f34a171---fatupu.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/615964445.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/rotonajigevorowiweluwexak.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/keminolupovi.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/54371262681.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb71beab58---75592724191.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/rizag.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/detolofebu.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/zitixidinusovodobawopum.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/81830579198.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_off0000af58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF58 10892 bytes
SHA-256: 1806077f69ddf9443a8b84480e875249b0e58757301540f320fbec699564eb7f
font_01_sfnt_off0000c85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85C 14600 bytes
SHA-256: 9b5bcea736e684d1130936e39a3b0894972e0309c69a4f0c553f92a41a80aa8e
font_02_sfnt_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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