Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7363f56314fc577…

MALICIOUS

PDF

88.4 KB Created: 2021-06-28 14:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0e82e6ad007bfce54fdf1e5a3dd9488c SHA-1: de51edd404c73ab9e578fd94c8e445f635a5c839 SHA-256: c7363f56314fc5773845334ef3ac21f3cc5a848d4f9ac6da55408b5427f6e825
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious payloads, aligning with the typical behavior of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=can+you+reheat+french+fries PDF link annotation
    • http://unseenadventure.com/userfiles/file/zetifizurenuporedi.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/74152ed3355eb1ac39d5422f86fabe15/71517325427.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/efcdaeaca42f7a82a0edc3ca0e328fb8/91963715930.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4bbdaf34040222a5e4e9abe18f1cbb98/23482679174.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/folinajusalelojibu.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/3hk9dic7knh6al2urlr3vv5aia/33188667449.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/4098324482.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/widebubixefuluvo.pdfIn PDF document text
    • https://netpage.info/userfiles/file/69461377657.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/8b0jq9jci7ri1ha1r65468au9v/1063754445.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/68433738700.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/farizos.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160867447050cb---puravomu.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/47273897830.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/96863424755.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160788ec88f6f6---91713690532.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d7773c9c087---94011801949.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/xiwixubufaleronuwuk.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2k6us6asqhpou1j4e1k2deo5f2/52342662736.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/2753908883.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607626ad73282---34653585609.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5161a2facc---24194468154.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/62912315404.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/55833399017.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/158574a0fb178e775e08a3e74c2d2c4e/lukavabukiz.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_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 18228 bytes
SHA-256: 849b7d07c0ff04e3883d9be0be8b5620dd6abe87df4c49f985913a8b3b159f26
font_01_sfnt_off0001227d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227D 10632 bytes
SHA-256: 538da0633a95d2a8d4d95367373a5f9dabcb89a30d11c0520614c9a50457921a
font_02_sfnt_off00013add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1