Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec131c34adc07a99…

MALICIOUS

PDF

90.8 KB Created: 2021-06-27 06:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 653c15d5ddded854afd70454920c94cb SHA-1: 29e0da3d69dddf2b19c502ca32f9362e13ef2bd8 SHA-256: ec131c34adc07a99c8d3360e75323c8714f9977e966e03185368fd08bdfbc88c
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's a link farm. While no scripts were extracted, the primary function appears to be redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae1978c0ae---buladoponilakuku.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6f65fc750daa2750ee8bde8ec25c17a9/sonox.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/16762778243.pdfIn PDF document text
    • http://accronline.com/userfiles/file/tobudabiwe.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/49355367650.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/gugiw.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caa68385a82---viwajidixapupopa.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6368b1884---21716552701.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/larezusonut.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/978ad5ecb74c693c38a750f4c2fa6d52/56545010362.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/1ea55350309e04eb6fc215804c19853b/39161202352.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4bfvm5b0o9828fj614hbo5mfa3/26506022738.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c20976c781b---fekijutipizan.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/01b7d8e96587e37be97cfbab4cddc5c8/11477050951.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/84osg2muvgpb4atf3i6kerun4n/60126308464.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/povuzupeze.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/tuxalefesurileg.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/boninabiziwojam.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160781e8b5d9e7---lirivitokep.pdfIn PDF document text
    • http://elitvorota.ru/f/file/3521127725.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/c08d8a09626bfcd393aa2ad00c118e75/pubebinaritevefetupexub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+play+multiplayer+on+zombies+cold+warPDF 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_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 17456 bytes
SHA-256: 18d9e58e1e39bf909056191a08a4e6ed7b9cb5cd72e87cc4b4a6f7e16b5e7e9f
font_02_sfnt_off000141fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FB 11164 bytes
SHA-256: 05bc49ca2ca71ec75c46bf3cb33d89de5e4fbac5d1fe1ec930a5c87e2266ea7f

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