Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e1021b57cf3f42…

MALICIOUS

PDF

90.8 KB Created: 2021-07-02 17:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 979cd243997b44924581006d2afcf5ec SHA-1: 4a962afda3d896742d9656912701a97169960d67 SHA-256: e1e1021b57cf3f428b7068e97bb1618d6ab77469292faab631db042f3b5f0e35
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, identified by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing. The document body is heavily obfuscated and unreadable, providing no further context on its specific purpose beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609841437867a---mupizaferipebexagi.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0dc0dv2usdg8roeenilvkvmur5/62151856986.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/37a35300f8734b8e178cfb79083b9e6a/gaxuxemixurimopik.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/c7a331e09f149c01705b96c1663eeca2/55426624043.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/7h25dvper8vf6hu9kffm34ghbp/98625173351.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca04e91f6d8---10434017671.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/6f9a98f469ab53f86a19f8dba9a7e329/88503674210.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gikilamakumibitunezeda.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/etdebhub8pugrn8d9gbnkg6uc7/93129861433.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/32083885498.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a84516e407---77225049885.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/refipibamuxiworefe.pdfIn PDF document text
    • https://jurad.eu/files/file/82403758539.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/86127e753c72b5d4aae272f5ea2d31fa/80909198402.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0bdae58ea078369a3630ea5ab005a1a7/jowivodewomefajul.pdfIn PDF document text
    • http://fields-on-earth.com/61318176600.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/64466150161.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc301708874---savivijisixig.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/gimib.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609082413c444---80635902851.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe4740a37---pelosanop.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc7aee0ec4---80420099647.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e43a85afb6---wipulofumavala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=market+leader+book+answersPDF 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_off0000ffac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAC 17800 bytes
SHA-256: ae7f9ba5f282d006209f639d3df7fb1c568391128a55a16dee34010bc0b3aabe
font_01_sfnt_off00012dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFD 10460 bytes
SHA-256: 8aae382ceb9ebff5691bb760b409e3161d7d36d09791bf4437c1f79a1b5f49dc
font_02_sfnt_off000145f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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