Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a20e61265fb398c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-14 07:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 44d8b7545a91dffb6322bce7fa87306d SHA-1: 10b3afb762fa756f88cec4ba5163f87bd6097f2c SHA-256: 2a20e61265fb398c6dfeee4e920f303915cf7a38825e5873247271ce67bca20b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=wifi+password+hack+on+android PDF link annotation
    • https://inverpalmas.com/aym_image/files/mukewabuxixebujober.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613114648379f---kiwevedepirogutijuzixozot.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/89315427195.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/64624936822.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/55870436716.pdfIn PDF document text
    • http://haphadoor.com/upload/files/95565716629.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/17177375384.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/dnkk21i250u5opbrna77gnjrhm/tasidifelawin.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/vubeluxusebi.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/55049522616.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/91824964771.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/96937655780.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/7f557698619d08d1699efe196fdb9c70/vilotunemudosixob.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/lezakoferovawaj.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab4e772935---38599123592.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fiboxenujuzoteli.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/54788801889.pdfIn PDF document text
    • https://websbag.com/uploads/files/zupiwedivoxeruratowazofi.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/66626867938.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/5178757260.pdfIn PDF document text
    • http://hangquangauto.com/files/nebomivi.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/53124217983.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/keniganulugutiw.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_off0000ea20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 18048 bytes
SHA-256: 841ee20be5acf6981098e78ec96da7508e74bbb2f9dbb3456b7413d2076e25e6
font_01_sfnt_off00011886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001309d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309D 10612 bytes
SHA-256: 648008814f6d0c7e70c1afff39c50b918ec808eb1fccac35f0d6dd60c3c0e22b

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