Malicious PDF — malware analysis report

Static analysis result for SHA-256 4622bc89328b70fb…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 14:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a30be431bc3eea4f164b51428be7c56 SHA-1: 2722c2bf629ad494fbabb110221e76562302d1c5 SHA-256: 4622bc89328b70fba8adbef2c57ce39dec3ccd1e0bc874f26a3760ee72bb85cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://losmarinoslanzarote.com/marinarubicon/admin/file/13046463942.pdf In PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b0374f81---gamivodurumukaripukopedar.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607faeaba8405---24680940955.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/2507c982d97917890de323d7422a0edb/bixelej.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ecbde4ec1---88230038348.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/vivajowolewikuxoraxobu.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/98052fc778b29b7cd2d0632aa91bfd81/17387559329.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/5135605500.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/fedilinagutepo.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/38517348938.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/sarozifisimomokabikos.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607085b18ef68---98379210042.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/23403415313.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/fametubufaduxenemazage.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/57032080920.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/28289932442.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/tufosu.pdfIn PDF document text
    • https://egca.fr/userfiles/file/60487432307.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/favufukolazefolubepijaxi.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/pi5qriod7goatlnpmi1mn7c9c2/jixudulalutemibabuxo.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/89209214254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=yoga+breathing+meditation+and+longevity+pdfPDF 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_off0000cff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF1 17420 bytes
SHA-256: 5b9214178fb6905c2203e3205222e91c101fdf041bf9458a3b49fdd5757aad28
font_01_sfnt_off0000fcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFD 11080 bytes
SHA-256: d8f8f021f54ffc93a1b99d2c268a5cec6f285438085887a7181c08ccd7c7ffe7
font_02_sfnt_off00011634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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