Malicious PDF — malware analysis report

Static analysis result for SHA-256 60673862078832eb…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 01:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 31604caff0f37c7725b23f5e153de859 SHA-1: be5f30e32d4cbe7aeab7a359c7230b75a35f767c SHA-256: 60673862078832eb37c837d71a861e8e1c5ac8c74beaa214dbc09f9727f42ab9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous URLs, many of which point to compromised websites or are part of link farms, suggesting an attempt to redirect users to malicious content or phishing sites. The PDF structure itself appears to be a link farm, with multiple distinct hosts and UTM parameters indicating SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://www.elmundodelapiscina.com/ckfinder/userfiles/files/ludobozi.pdf In PDF document text
    • http://lineshare.net/upload/files/20210903202655.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/61731349624.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210911003049_iofa4o.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613604e9f389b---22495125750.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/wazunumeki.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/44994621220.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/jotunowabo.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/fires.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/64721494433.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/bujuzosodokutu.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/66458344202.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/werifugugur.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc8c7c24d---27970424552.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/dipazabutuzel.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091809454044.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/39981955092.pdfIn PDF document text
    • http://prompol.com/media/file/zaxoboboxipisuvaxuxur.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/ridexijurowo.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/goxabesido.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/j431cbqukgoqk7148v9ogpef40/soroporabuzamojojofa.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/pimonanabusur.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/pitumewadapi.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b3ad1b197fcfab42d0cdb20e370fc6fd/3676314092.pdfIn PDF document text
    • http://tulga.ru/editor/files/xodafuje.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/xaruxomotamozajazodofup.pdfIn PDF document text
    • http://esejsc.com/upload/files/16997553871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+use+phone+as+game+controller+for+pcPDF 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_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 11012 bytes
SHA-256: 7d78c4f60077a75ad8b155ee57ea2910b7f8db4c8ee4600c5639219e53748e65
font_01_sfnt_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 17724 bytes
SHA-256: 54cfa220adaaddf151881f2b4704da01b7d66bf9a131967d002cc556922dac39
font_02_sfnt_off00011e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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