Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5d9759c7d5ecf4…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 12:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6647941373c735faec507be1ff044f3 SHA-1: 8f7f8489219ee7b6e82c0f80b9d53f4521a9701f SHA-256: 5b5d9759c7d5ecf4d4e76fcc935e1f54fd42126e110d3c0eacbcfd3079dde5d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of multiple external URIs and link farms suggests the primary goal is to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=rolex+cellini+moonphase+manual PDF link annotation
    • http://texmet.pl/userimages/file/waripenakajewenugidiko.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/vopetesukirex.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/suxeranupesetotozo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1e327151f---posenaginonamitosobasese.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/suuu5j6qaficu2j2rcq3qog1d1/juxidoxipaxemozedaderi.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/51221234801.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/67071645194.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16096ff2186304---majokepugijopovexinasexam.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/d8i2k17u0saqbpttekv4f203qt/24149320088.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/naxitikixutimufoval.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735d4ac2a96---rekiwarobekanafaruxe.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/gofimezefumuroxixo.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126d7269f4a7---80996534258.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/ziwazofam.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/50f39f3e87c88de84c2cbb3737bd1cdc/biwawokubexiref.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/bc5ebaf06c7551b8dea3c524d7f34355/13705134570.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/61104604424.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161163d66da6af---87467982362.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/37823295630.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/muresagujeri.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/bipapagovasi.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/74980663029.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/d145a52ff6ad879557c6386f59078bc5/fufufovijiwifukege.pdfIn PDF document text
    • http://biomehl.com/images/content/files/92069973976.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_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 18304 bytes
SHA-256: a8797293180f2e0dcd338078eac363723b15239e6aed9937acc65f8ab9191bbf
font_01_sfnt_off000110c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 10688 bytes
SHA-256: 942e9004ce0ade230c8ae87235182d904d3bdefead4c73198ea5b08e36ff080c
font_02_sfnt_off0001290c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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