Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55292d4f42403ee…

MALICIOUS

PDF

85.7 KB Created: 2021-07-17 10:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 569505c9b97799e228644d1bf7892fed SHA-1: b12539faf66ff9cbd9edd2d0cdfaddbd8ac909c1 SHA-256: e55292d4f42403ee3e1ae4350224b2a7520ca54c37250479f0040f72085f0255
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The presence of multiple external URIs and compromised upload links suggests an attempt to direct users to potentially malicious content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://allseasonsart.com/uploads/fck_uploads/file/51480889074.pdf In PDF document text
    • http://ansonseatery.com/uploads/files/sajujeseg.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/xadogakawapimoxezazixug.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd16e8889---47771173468.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/58721017468.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/xesokilenasasavemujim.pdfIn PDF document text
    • https://waroproject.com/file/86252542340.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/60023990436.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/julolifet.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e3eef6ec17b7c09c2eba2285738e5c51/87535815111.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/cf7b885deb8724729f94cc38c7854a1b/57486171738.pdfIn PDF document text
    • http://allycatering.com/userfiles/jidiwokeluzesizat.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/diwajuzuzejesom.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc9ca922d---21139914767.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6abfd1780f---fakavavevuroxalikubokeje.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/55c2bb20cb905b2c8df84b1563d6c547/23044304206.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/79196382156.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/34998697310.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088901c5c9f5---75585834776.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58e32a7c5d---20601115578.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/08c214d339d7f54acc1dc54afa7c5c2c/77820815678.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/89331595710.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/g12k945gjqln0bv7gdrkos4m5v/gomujajivizuzosudu.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/25953455732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=electrical+control+engineerPDF 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_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 17332 bytes
SHA-256: 8018d45986bc6c166457f0b9a8724dfaebcbcceea71a7c84f956207c8f1fd8d7
font_01_sfnt_off000118c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C0 10220 bytes
SHA-256: 1db55fca1700c49a1bbac2fec7feed159e716a9f776fd0f2bdf65179115a4d97
font_02_sfnt_off00012fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1