Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca509b958f3d1d7…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 14:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edbea19213ce7d20be688d465a16cf8b SHA-1: eec571c895eb82e4f907ee2cccfff9dcc03aa3da SHA-256: 8ca509b958f3d1d7d790eaa5f2824fee9f57ca0457ec34e8b21b543c0e2c742e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with a 'utm_term' parameter further supports the idea of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=fx+photo+editor+apk
    • http://symbolfoods.com/files/file///vurozonaz.pdf
    • https://giridhareye.org/ckfinder/userfiles/files/55182921145.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/68f9c94f4c4f6d50f9d6d4146a2e47bc/rikasimu.pdf
    • http://slovbau.sk/test/userfiles/file/musiziwif.pdf
    • http://tnshoppingbag.com/upfiles/file/vodosamefuwifawitimawef.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356ae33ee55---11423388130.pdf
    • http://paneldeconsos.com/userfiles/file/66227131164.pdf
    • http://kraski-chernila.ru/resources/file/33137815372.pdf
    • http://regmac.net/userfiles/files/sovunusezatelonaso.pdf
    • http://aallergy.friend-match.com/upload/files/45360552300.pdf
    • https://kaskad-74.ru/images/uploads/wanusimek.pdf
    • http://www.chubsorn.com/file/files/95340927231.pdf
    • http://detectiveoffice.net/userfiles/file/lenabumopubazonefujakuv.pdf
    • https://pezenasenchantee.fr/userfiles/file/papokenajatenajakudu.pdf
    • http://archifolder.com/userfiles/files/bojugizumofotixaxutamusaz.pdf
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/15631264716.pdf
    • https://adci.vn/data/upload/file/87057207097.pdf
    • http://billedbutikken.dk/articlefiles/file/ludifigutu.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/80997990591.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132a0dc4cfc9---vajarasikupemux.pdf
    • http://aquaclub.hu/userfiles/file/vofadalatileje.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/14801a31816a0ba99bfc7667bd097bba/dozumixixuzed.pdf
    • http://driver-jazda.pl/upload/file/bepikivipitig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dace.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 16792 bytes
font_01_sfnt_off0000f2e0.bin
b901100fa26b900917c2042757ed00e7a7b35111a1da1fb242df78c15135b9a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 17652 bytes
font_02_sfnt_off000120ad.bin
38a5373d36139e0aa2b77c591e72cbd86eaa16b1247c9dd935ee4b4182cf85ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 10344 bytes

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