Malicious PDF — malware analysis report

Static analysis result for SHA-256 4298603db946ec61…

MALICIOUS

PDF

80.5 KB Created: 2021-10-07 07:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4deb2e44709d59f92ec92f699951f29a SHA-1: dcd465d3a32465e21b2cf3f6d971d351350d513e SHA-256: 4298603db946ec61b971a6a26ea51d97b3bf7a00f425ff6728e2a8f2d39fcd04
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the heuristic firings point towards a spearphishing attachment, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=pulled+muscle+in+side+of+back PDF link annotation
    • https://actaviaserica.org/board/file/files/jixijisizifiguk.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/19634697193.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/xesopokasejakewifoliwoxi.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/xivowedovego.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/lesavaxebefulutoturo.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zumejiwuwuv.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/18373645766.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/11386822780.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ade62a98---juvixonatimeza.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396c477094a---lonomazimuxefugif.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/mofirenafid.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c984bd008---57152496727.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/13385275170.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6206015d---80503821326.pdfIn PDF document text
    • http://laserinnsbruck.com/static/54571734095.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/25672762637.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/zojonotuwumu.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/rupanekelo.pdfIn PDF document text
    • https://oasis-travel.ro/files/32925501346.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20211002172346.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/zeloko.pdfIn PDF document text
    • http://pronobile.com/catalog/file/81214334864.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/38631164713.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/nufivoju.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FE 10772 bytes
SHA-256: a3e9d7ad7eaa0df69272d1ae0b11f93baf9e793bc2692b2f8ce04094d012b2fe
font_01_sfnt_off0000e9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 19112 bytes
SHA-256: ded95114472b5ba83d0720971d8a143bc8cd749c501c8a121ec191a9ced403bb
font_02_sfnt_off00011c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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