Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00be9c4f50665bc…

MALICIOUS

PDF

133.4 KB Created: 2021-09-07 21:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b704492594d2ece9137841061cefb7c5 SHA-1: 0b1ac16c88184f021d80dc0cfbc89d856d0f3f71 SHA-256: d00be9c4f50665bccd3a6b882dac8db5867675f8e54a1034037e91d3f2aac26f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://allytemp.ru/uplcv?utm_term=ser+protagonista+fisica+1+ano+pdf PDF link annotation
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160726496b83a8---totavaperuluzi.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16227076361831049078.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/15066850574.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/kafab.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd328d18d---64138779925.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/memibu.pdfIn PDF document text
    • https://qqhanoman.com/contents/files/16905095008.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc542cafc---tisojujoxavosebovivopo.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bb5e7b726---82725235137.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099b3aec565d---79214208178.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/bde4038c64272279102a76ee024662c0/82329219508.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/96695755006.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/difobesef.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/e795623f7922e570be5bf90093881693/derifesadebukevubuzixij.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/90437323222.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc4169badf---lepokifitofosagusobepe.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/neravo.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114c4355bad8---99474241263.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160edbd44b78e4---zerom.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuwixalo.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/20670545058.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160af3fb378c43---50294647517.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/58058083441.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_off00019f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F4B 20700 bytes
SHA-256: 3ccafaa8c04736c558467a1f488b68e79989176b9fd28c5febb3a239de97f44b
font_01_sfnt_off0001d685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D685 10876 bytes
SHA-256: 5fa2e9de936e7b6e0cd74edc5c5ff3ffd612869ee33334f27168e0cb1462e288
font_02_sfnt_off0001ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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