Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc26d02bc75481de…

MALICIOUS

PDF

87.8 KB Created: 2021-07-17 03:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ddd5a60bdc22bd3faf8d2846e55b08f0 SHA-1: a0ad898256623b262a3e08add3a97f4025c009e9 SHA-256: dc26d02bc75481dec9e06c2f38444b5afe07b0dc83d442bbacf95b58ce708523
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/30973a67085ad25ffcfdd75a7b5a7bbd/bulaluvajedafapuv.pdf In PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/puxawelujujalow.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160968440b29e3---bepupejetofiretazeg.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/fbec995facb3df18f055892da6dd8ff7/56628127917.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/b3a3fcqcnsnilliut4odj1gqk6/zilut.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/64890962954.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160901b100383a---58106307779.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/91e63860a19e6793b93485aeb0d819cf/68904723205.pdfIn PDF document text
    • http://clase86marista.com/clients/25276/File/tuxaxukiw.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/rbtas3ife5p2hk94a6iusam1h1/63916081027.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/gowodosilogipitewiwimu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5331e32d---77082663275.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/wubevogolezonizorenizu.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/aa38f2268bb79c5b2f30b5a247b46515/10805696540.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/071e72c932341b914d3d3f8f8007f86b/budulaludakuxeb.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/keruwirepomatobagitugebev.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160895bd24e721---67001644905.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/31336965801.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/mukumar.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/al94c5e9hdq3iolb180h8qoc8u/55752908014.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1999abbd---30876116099.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/25050705790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+game+need+for+speed+most+wanted+modPDF 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_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 10836 bytes
SHA-256: e04d730237a8ab17dac7a5b23a664ba702cb37f525ee3d6704b8ef81cfd3faec
font_02_sfnt_off00012341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12341 17772 bytes
SHA-256: d8d2acbd10b76231205ba74f24a35618cc4ca252d0e9565ea7e0f2a687ebac48

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