Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e35a6e08cd44294…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 13:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ddebe2c46abbcbffc4a4c173664b6ffa SHA-1: 36da36edc7dbb164439144337515f841cf230ca6 SHA-256: 8e35a6e08cd44294080f301d987f9f332af0148829df03ba57e3f13c2870bdb9
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://provia-events.de/pics/fotos/1/file/pawapafekumutuserotanir.pdf In PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/99452680058.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/60707511695.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3f912e493---20774206930.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/mirafuwujepo.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/1203754546.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160be93cebe6ce---rakilibikofemodabiguv.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/hrksuboo0ik2skaft2oqvuhg22/xijuxojomavineta.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/waxujisapubezuraku.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ir6amqshbi2bv05ahj6fvu4nnj/gaduvixo.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978977b0841---88494049864.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da702ac3b4---xibedofo.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/s6a00vk4vn1imhg9554455h9nj/25587281964.pdfIn PDF document text
    • https://airshow-bg.com/file/37529709135.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/95b7481339660a2628dc196948f5042e/84234269500.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d39df0b78775ff3125a9c5db2a626643/kevigozemepabesiviledimob.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/18893658629.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/47076476585.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/4328e25b4405c91c539234f6665fd656/fupizunetu.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/gawuxiketezujevalatuxo.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/13420146507.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/fuxokiwab.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/musugajitomedixuwasuzag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=duties+of+security+officer+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_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 15944 bytes
SHA-256: b4d31d0431208815a48b8f587578f04c06b00a017982791f3aec4ae48fc497a2
font_01_sfnt_off0001077f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F96 10516 bytes
SHA-256: 7ab2e79d58a9704f276ff9bda5f5c805300f68f29ffcc5065fac7fe6f96606ca

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