Malicious PDF — malware analysis report

Static analysis result for SHA-256 263dd9cbece4b720…

MALICIOUS

PDF

85.1 KB Created: 2021-08-21 12:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 178072c141514eae9e5353df95384f2e SHA-1: 4635dd737092614c8db8d1a8efb6b95c6d8393bd SHA-256: 263dd9cbece4b720e7c44055ddcbf2e7e122008408412c8d17e26610c3ff1226
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://laborke.ru/uplcv?utm_term=how+to+read+gas+meter+landis+gyr+g470 PDF link annotation
    • http://sdds.be/userfiles/file/pakixagovofadevezubusutis.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ebvd52o6od15jamfnmqj4uv4vk/zaxazanele.pdfIn PDF document text
    • http://contactconfiance.com/files/files/fajenusubewalefamiwexuli.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f0448bc290d576ea39ae51394b6807e7/lezuf.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/gawijebuzebejobizuxabatu.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/23127595375.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c637762bb51---13805316808.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/tudepuluvukazi.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/9mskmpqkcdqpmtaaa9unr3saf1/misenarenudexibipeli.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b439968e6---rebelimonixojijagabowe.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/13833739616.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/7693500076.pdfIn PDF document text
    • https://isleo.com/i_photos/file/53005674291.pdfIn PDF document text
    • http://air-con.ru/upload/files/pugedut.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/28481985211.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/soteb.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bef0214f5f---dejale.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/ccbb5deded1e8560befb250599d7e5cd/96852277397.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/abfde241bd502ff10f515207e8b729bb/fipekikepul.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0hao54htf1t4ikuhff8crnn8lg/93355304330.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/78681224887.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4430e9be8---jenotobes.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/zokumodajijib.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/92901852338.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa34faf08b---fadopuvuvomuvegofaluxalip.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mr178ive24pfi22vnqn7dfhqn7/79001551954.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/480d92b85ef3db7df58c45c0546406bc/93559883370.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3A 11032 bytes
SHA-256: 609115a315f883efda3f7d35cc0cf7580b8f85b3a591510e116eec251e540855
font_01_sfnt_off0000e7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BC 18108 bytes
SHA-256: 3659ad0cca4409da5fb81c9d6c16ac89099e9364597c011acccadcbcac05428d
font_02_sfnt_off00011668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11668 16364 bytes
SHA-256: 3e163d7a0954889ac6348a127825d1cf1030a52c833756f7da8ce04c78165b61
font_03_sfnt_off00012c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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