Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66b2755a9be90ed…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 00:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 74cc394f3fabf2f0850e29a88019d1e8 SHA-1: 31d8b0ae94803156c852e6d6fafaa242a4f83f9c SHA-256: b66b2755a9be90ed1db61a7a36185ce757413cdc39f123bb6c8f9791ffd0f7b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3ad5166b1c2e49a30e60aa752a261af9/legevaduvi.pdf In PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/p9mq3vkjh3c96q9jjbe236nm7k/58820511405.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/jki1a036k2v0bhjgfemu6q5ieo/pojadimubuxakivo.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/mupigu.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1630288771234865329.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cf321a78b---96172410450.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/nezusifatugiwobiboxotad.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/54487902260.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0460a7c9a---98031332401.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/58645396179.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/fuguputiji.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f9d3cf636---novogabavomo.pdfIn PDF document text
    • https://bselink.com/userfiles/file/wijebesunafe.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee1c355dcc---79886565871.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/tikaxavokojigikuvetop.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/mafovozavajitosenimugo.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/26ae40c34adf2778eee167c5ab444374/refatozowimaxovusipi.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f6ee12e8e---52921951596.pdfIn PDF document text
    • http://szm.hu/userfiles/file/nulopewebumazube.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c9653f5e6c5---21668809046.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2a4800b2e---sivotesubogafajidojovave.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/1bd186ce4ed111f1f6054189fcde071c/jiribejomuwevivizemigagel.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bede4f893---supisiwafuvetalitefub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=if+clause+type+1+examplesPDF 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_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 16968 bytes
SHA-256: 1fd2e4085813042ee4e4b6c75d07d0852c9145831550ab64e2af628289185180
font_01_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 10544 bytes
SHA-256: c9729ff8094eb762af2bf0f8ca4c2dbf98d1e6abf600614e6f7d2ddc65934117
font_02_sfnt_off00011de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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