Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f4bb33f62748bf…

MALICIOUS

PDF

89.4 KB Created: 2021-09-03 01:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03b320448ebac298ba0c0a693588c914 SHA-1: 57d7b0c21293e1b06c97a0af6f69cce315280dd3 SHA-256: 20f4bb33f62748bfad18f25aeda8749d33ac8d22716ed73f0cb8df2f875f767d
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://universal4shipping.net/userfiles/file/tazazesowogagimez.pdf In PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac598211383---vokokotekokunuf.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/ljluoeh4kn91tb4of7dijki6b1/6661806146.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/21490143086.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fc4ac3b80278a5262d3dd9c44f94e990/pixebag.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6df8172b30---23322277240.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612be49e984a2---didatekitasapopinof.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/96114287987.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/15758231049.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/nakadewow.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/h7f7agaa65l0g45mljc2ahcs4u/69483639176.pdfIn PDF document text
    • https://ksuskalology.com/images/file/bagukobesikep.pdfIn PDF document text
    • http://homeopathyhk.com/files/74681380110.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/87567115103.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/30920525124.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/fenaranufojamenunoduv.pdfIn PDF document text
    • http://chengzechem.com/upload/files/84666449825.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac00216d1b---sanamexidamuzibe.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/bobafulugitowet.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/05dspq374mqi99kbsv7le80lq5/bufewudaliko.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/pikosenamujude.pdfIn PDF document text
    • https://limadelimon.com/images/file/68833998970.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/87605621629.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/212372392.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c20635a49---duwekurabotabevan.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/gamarana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=agate+cnrs+pdfPDF 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_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 10520 bytes
SHA-256: 1b6732e4a3c20fd8826ef8695bd8c98bd6e8af9ed0bf02d95a5de3226aaec3a1
font_01_sfnt_off00010ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE4 19100 bytes
SHA-256: 7933d95978484913fc9a1d56a8bb0c225f697ca23061688e3144774f74764346
font_02_sfnt_off00013eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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