Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f668622b9e1e1d9…

MALICIOUS

PDF

112.8 KB Created: 2021-07-04 21:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4ae97e5cd8c6e14cd030c248bb201f5a SHA-1: 3c3756f041e44c3551ca859f6071b4064277ee19 SHA-256: 8f668622b9e1e1d9022d469ac9965742479076fe4a00e863355685fa0ee2398a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the heuristics indicate an attempt to lure users to external sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://adamlegal.com/userfiles/file/werotefew.pdf In PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97f5eef880---samenekafejajimejabisofe.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b03c128b92---fofikaw.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/toteluxubawisafijar.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/jisegisozawojolosip.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/33d71c3dqape3q6nf1jldl45m2/zozajekugedilokezejaro.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/zapofi.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/vavusuvimelarabuvusotebe.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/nj4og1ee2ik2mmr5eaikevfh81/54287508111.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e74bd37668---32222176273.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/kelarewoviroxovazifipan.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607124f2d65d1---98931613637.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0307546028---nivubomawonubuxavuwebosu.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/t526gv9gqdci8905imgenmhhb4/taxotuxumekisuxilifezag.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b38df8f5f14ac814a65dbcfff1b8d9f4/nokuzelokodatimunubifun.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/3e39a324f19c3ad52406d37cae711648/74462050670.pdfIn PDF document text
    • http://stevis.cz/files/file/xitagusopodi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/j2lj7vgm0k4ks1ic03b7usmpk2/jupokomigezivo.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/33076228340.pdfIn PDF document text
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/71347274821.pdfIn PDF document text
    • http://roocenter.ru/upload/file/betotugufisifutam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=differentiate+impressionism+and+expressionism+artPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001467c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1467C 10716 bytes
SHA-256: e4b3994a4341e2446f1eaac8183c4e1c33da7608d6e2e1f0d5eeba559e866637
font_01_sfnt_off00015f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F16 21532 bytes
SHA-256: 46e6c502014a5ca308e4e130de727aa7575009a6174aff67d02e1531d6118432
font_02_sfnt_off000192d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192D4 2344 bytes
SHA-256: 145665b42d37d91d90a44716b3ba7e5be94b606fe34ecb164c9be37c55ab6c0b
font_03_sfnt_off00019d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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