Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88459bbd942bfc3…

MALICIOUS

PDF

87.4 KB Created: 2021-07-26 00:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 678c42e9eeb6fd18d2ddac047c0d5b92 SHA-1: 3a5385bc2cf1c932a2d617f4731b297ce39b2cc6 SHA-256: b88459bbd942bfc34f1232a1c6c099c6a11ee7ea941fff6ff3c6c433f0db7f6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://orderbestwings.com/uploads/files/37496304558.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5293760be3---jiwunudunir.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/ziwemafiliragafumezinef.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160795e1e94513---vuwoxopowufarutifidi.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/74057716077.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/xinabakogorop.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc7f1bedac---xunowamitegefunabuwogas.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160862c8e13581---34265990272.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/81300bba862a31274452aef57015982d/wumepiwevupevevijopumosus.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080dc0c96903---pujezasamazinog.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/71143346540.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/veritag.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c5c651af587f34a34bbc20b913be3a7e/tesixirowemofumifotopixo.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/lofomevoxapu.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b675190258---nutipobokuxul.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ab6d43605ddab80be97bb55bc62cd238/20291597672.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/suzuxaguledenokonobo.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076db19cc917---18410852780.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/navuzigaxewovarudetogalu.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/talakami.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609851857cff8---91203973378.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/62268548389.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/54099157889.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085a64c3dd12---xenosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ultimate+car+driving+simulator+hack+mod+apk+new+versionPDF 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_off0000f0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AC 16872 bytes
SHA-256: 4ed888f251a7399a898fa8356df41792a75be19d6c935f467b8c6ed39b0f6b83
font_01_sfnt_off00011c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001346a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346A 11312 bytes
SHA-256: c299becd713bbf8fea864daa1baaa5f4b7657aff480ff47673336c2bde9b0bfb