Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e90c84c36c5226f…

MALICIOUS

PDF

160.0 KB Created: 2021-09-05 16:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae22499ffd4a42d4da4ac782e36789ed SHA-1: 0114f7bb21390b2a347f50a6b1c8c957e3afc8eb SHA-256: 8e90c84c36c5226f837ffe283807544b8bffd8cf8c29ae849f032f6dd05acdb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=www+cdpress+ro+manuale+scolare PDF link annotation
    • http://whuntex.ru/userfiles/file/nipuwowedo.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/83475947535.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/27737574798.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e850d6fc7---36871028655.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/9fe0bab5f12879671e5fa132519b1926/13573471117.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071af7f890e1---suvubazevar.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/78706246442.pdfIn PDF document text
    • http://bscartridge.com/pic/fozuxaz.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/fovijokiropuwizinas.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607843c2c3652---60733928167.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/33936712879.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/motaxedatadigozukafil.pdfIn PDF document text
    • https://petala.gr/userfiles/file/wurevalufalurovaxagefi.pdfIn PDF document text
    • http://nova-auto.com/upload/divudarejimovepaletis.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/65538276291.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/xatujiru.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/porodutid.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/53325271669.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53a166db98---98683454472.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/zenedimuborotufasogulozuw.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160824d9a8ac67---laruxejapelov.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/df6298d3733d1d1b8fcbc47dad04f06e/81334362600.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a6876a47---3794526437.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/3194770377.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/e1d1145f4f467474f8010d2a3ad0cb59/54674017932.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_off00021432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21432 17152 bytes
SHA-256: 48af4f5f2964ffcae80ebe6ab9ad67b39555f5710040bc7408b536311441915e
font_01_sfnt_off0002404a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2404A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00025861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25861 10664 bytes
SHA-256: 5cff23ea62f52ce82147f433dd1680bb89ac50b98bfc00dca0633f4baa8641cb

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