Malicious PDF — malware analysis report

Static analysis result for SHA-256 266e2e0832570200…

MALICIOUS

PDF

75.3 KB Created: 2021-09-18 21:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0935abba7a88a7ed421ba04c91696adf SHA-1: 021675295894bb450ad19715ef3438091d3cabd0 SHA-256: 266e2e0832570200ddd41bc5f2c5b6549363343a712efc71909e4f3b919d347b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130645891f6f---jujulewo.pdf In PDF document text
    • http://scoutpate.com/userfiles/file/bupodafifipikepuxi.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/raludoxelomipuxod.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/26989038065.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/bufurogewaf.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/wexufetimizebowumaz.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/vosuvirifowazosu.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/51848476418.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/bizusumitil.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/81279490158.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/radufagawetet.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6f33c23b5---fenabizebesonefosis.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/67343892032.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/sotogagonuvosufufovatuxur.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/61753968060.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/c7683bd58fce462275a45f1ad27da79b/51991021197.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/59011355153.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/85017120426.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/salonutizufujixa.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/51011582346.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/98210268117.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/99894788147.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3f84cfd3e---95839330239.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161418c9c29cb7---29956083875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=shortcutter+quick+settingsPDF 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_off0000c398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 10716 bytes
SHA-256: ee452599eefa56109c807c4b896a5094a22e3999614b1254c76282784f57ef04
font_02_sfnt_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 17056 bytes
SHA-256: 5825d35b615578e6e8520fb826eeb86cc63e09fdd1867a551d5a6fe87db07a68

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