Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d42b88a5cdaaf4d…

MALICIOUS

PDF

98.1 KB Created: 2021-07-31 13:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c37e92607dbb117f2d4ce1f8d1491243 SHA-1: 53c33e556743796e76d5a5276eeef91e71f9f928 SHA-256: 8d42b88a5cdaaf4d435a91bd5cc67c83393e9d9fe803b59f4da58439e20230d8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pistant.ru/uplcv?utm_term=download+batman+arkham+city+android+apk%2Bdata PDF link annotation
    • http://kalikraft.com/images/file/79509688563.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/pekubinifuruvet.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/gededu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd15ddc54b8---tepaxuwupunekugun.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/fc6261dca2791ade367361117c6ab1fe/17200112369.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c159252723b---wibisunebelema.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mikinatowevixolimin.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/43608349767.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/jawufe.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/0879d9ccfddca819e9ae2f301dbbd52e/lakunizajubirarixesidekep.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/94591026290.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9116750bea---bokazekoladu.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/fowavezonekexarakol.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/7br6vscs4f21delarq3atc35ep/wapipulopiwulemudizokarew.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d259b185bdd8eed7eda5f4ca2bf993a5/sejosipuwakekoxeda.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/53737181594.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210610031522.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3689033666.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/58836078756.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/3b2c371a9873be0573e6dbb1085dc428/32387268312.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/lafofabuxof.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609185b3eca78---vuxasugoxipepofugowakazi.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c48c5dcec6---liduloromajiwalatedegu.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161044548135b0---pobaken.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
stream_007_off00013f98.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13F98 19908 bytes
SHA-256: d3091945cc80f1466ccacb03cae33eabf7bb5c1874736c8cde7edf1773a22f89
font_00_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 19976 bytes
SHA-256: 088cab03ed74b42657966ee371fca38df23b48260d0a739f4a808fcf0228831c
font_01_sfnt_off000126c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C0 10912 bytes
SHA-256: be649f300c1bb18f8f7d1d257f77f4e5941c5301887ba6931681037d33f90ed9
font_03_sfnt_off000160da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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