Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c61e7e49bc0c1a6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 10:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 804959fd93e781e90652bebdb190c912 SHA-1: a6885ed26706c184443ef101e3def7b22db2ba53 SHA-256: 5c61e7e49bc0c1a67d2d7db53ce237f60d35530e89f14806c5438df66b5f27bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. 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 URLs and the PDF structure points towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://garglob.ru/uplcv?utm_term=freeflix+hq+apk+2020 PDF link annotation
    • http://jj-metals.com/userfiles/file/2021090211141873499.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210908054803_agjj7k.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/74918420559.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413fce3ecfd---kolufexulifavisurir.pdfIn PDF document text
    • https://eclearusa.com/images/file/nanawezasifasa.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/pedatugokidike.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/togurojesowonepekati.pdfIn PDF document text
    • http://uhorder.com/upload/files/vopola.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/13472648001.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/2d645cd4f5d3f7015576420065addddd/rosik.pdfIn PDF document text
    • https://digireg.si/upload/24530280842.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210912195154.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ghlh2jn49r5tnhdjchfbntu2ta/81907921389.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/xisizolitobed.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/82409420502.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/barukiwunesaduke.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613327cb3bdf3---remikuliwasiwok.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c7111c05e---laluguzazituva.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/sebubivefuk.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/wijadavepefenufuwiser.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/pibexabiranekegad.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613504ce64f97---47606204052.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161365efa6e9a2---44737035098.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_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 17808 bytes
SHA-256: 1bd6260a65a76695f885a2fa82f777b14ad105e7d7af443214bda417b65e7bf5
font_01_sfnt_off00010a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 10524 bytes
SHA-256: ce235edcf601ea8e8a53ce62ecbf15fbe6417a4fa8e6353fb0dc69f0b015dbc6
font_02_sfnt_off0001221f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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