Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cfdbf5371dbd48…

MALICIOUS

PDF

72.8 KB Created: 2021-09-05 00:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 058263ea0e9030060b8d54887cd98088 SHA-1: 56b996058610815f37a6dfd41c9cc2de9ff4d557 SHA-256: 38cfdbf5371dbd4833fbf806e59d37ea1b1946f931d1d4d520a58171337cb3de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and links to compromised WordPress sites, suggesting it's designed to deliver a secondary payload or phish users. The presence of a link farm on disposable hosting further supports a malicious purpose, likely to obscure the true destination or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://deepex.hu/hirek/files/gomiz.pdf In PDF document text
    • http://netmutum.com/userfiles/file/rowovadoxinazuwilemet.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4ab356f77---47289449590.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09e3f54819---26007089634.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/lawifezinuwavurof.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/13ebf30df54b0fd5625be668986be9da/39430032614.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c449acc3d3b---menin.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/48932247674.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/24237975957.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6dfdc3948---jogadoji.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe04ed40b1---45082631664.pdfIn PDF document text
    • http://cwesp.biz/upload/file/gugabe.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/43314040714.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/gotirusaxolodagonipazoli.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/2had5sou70041059esiapc0vs1/vewomijosalonexor.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a580116ab79---titekinogozujukavem.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/41390098484.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/feruzefapev.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f67d5795e---repole.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/24cc211c5dbfb0ee56bb7e01dc74ea31/kixud.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/sujurixemiradugemab.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8qdirvevl27lqvgvjtrg3tbuv0/zarezibid.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/pqicahf1qjemgvkpmessfhj0a9/kovunuritamotilafox.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/jujusewuwovifudugotex.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/39879772714.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/77505158943.pdfIn PDF document text
    • https://csodamalom.hu/files/files/tuput.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bio+data+form+pdf+file+downloadPDF 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_off0000bb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB94 15976 bytes
SHA-256: 74de8a2a74b9567ef04a65bfbde17e4b5cd66d95be3bebfc5a829d04b5d2c411
font_01_sfnt_off0000e4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AD 10632 bytes
SHA-256: 5f9ba7d97f90588710213bbd1879513d97f26187cc3ab3dfe05f532e2ae362e9
font_02_sfnt_off0000fd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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