Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa534697bd9e88e9…

MALICIOUS

PDF

83.1 KB Created: 2021-10-08 10:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3fbe5c2453be0ee37328b6a96ddc8c39 SHA-1: 3595077d0bb2f3cb9fe833a5cbeada77085c92c9 SHA-256: fa534697bd9e88e9090901a7494b020ea3431e16fc953396eaa0e108c144d560
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ketchas.ru/uplcv?utm_term=building+secure+servers+with+linux+pdf PDF link annotation
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/99870951330.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/filezenetam.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/nuselavumogazokuw.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/6ck1v4desnbuhouq66orvo8tal/80628260983.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/58607874124.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/pexirex.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615830c97df33---58054767136.pdfIn PDF document text
    • https://kpii3yaw3-7nc.com/contents/files/dejipoxesinigojerare.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/meribajuluwufimipesutetim.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/fabedajek.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/958811d22000f88ad0b90403e08a3afd/33121163618.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/kijoxazinawe.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/kopaninanopexirimoman.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/ridobaxisiteta.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615ba7da8b065---32673904594.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/tosopemulavarusikameru.pdfIn PDF document text
    • http://espokebar.com/uploads/files/92576734445.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/34706198808.pdfIn PDF document text
    • http://kmimmigrationlaw.com/userfiles/file/97375241942.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109110944553700.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/mizim.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161423c468d0f6---beregitun.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/92f80dcbf7511d16bf7180c30902b49a/laxetomezebanix.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/jamotona.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/57367141946.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150810c13210---fagenesupujox.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_off0000d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 11024 bytes
SHA-256: ea79f2dcca31bedc9e9b98eb9f02354a707d22eab79a37d4384016e361e3b567
font_01_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 19928 bytes
SHA-256: e797dbc25b7fe1913bc26f4b116373f7fc02a646782cf23fec0c5787a1be0374
font_02_sfnt_off00012658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1