Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd869df97acd3e1…

MALICIOUS

PDF

95.5 KB Created: 2021-08-14 09:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e131d763e74dbb3980ddb71a9e286409 SHA-1: 30046321cce3cc35ba723d89e059782b54d11e92 SHA-256: 9cd869df97acd3e12e4f2735474f7990c4da0960e27c3a0b43684353e71cb9e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://crewmak.ru/uplcv?utm_term=can+you+take+the+asvab+at+home PDF link annotation
    • http://allaboutdowney.com/userimages/zatovigo.pdfIn PDF document text
    • http://waypl.pl/upload/File/balebulom.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a04976ac---gelubomokawukimi.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/39863339892.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/rigoselozekodumopewen.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070abedbb79c---lofudotejozineluvesovok.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/1418120d33ed09e1d8d0e2e72fabbc35/44505005717.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/kad3ssmsdpfv9hqleshgpim2vo/futuwekekuvejasivujasa.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/72ash7b6j3ej45gr1do75mm24p/44933340061.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/xojum.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/17d4vb38m6ne0u7ngs3uevi83u/40853484836.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/zovodu.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/tobejorepiguv.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/fezinobi.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/xelewirimevadem.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/2uf8e9oa2imp7uriguo48jfjg2/vitezad.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/995ba2f65c7f9143f1b3d4a8ed9cd74b/73012942091.pdfIn PDF document text
    • https://fasaac.org/temp//files/25059345235.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/baeaec85514d7d6d4def298bf79e8793/10203992067.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/bd9843426779b434eb43fc1740eebe70/baxizijuzisolopef.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/13622058852.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/43866063987.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/soxarafukeluf.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fcbfc12929fe2196f898246509a527e0/nudoni.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/27267451900.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_off00011123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11123 17636 bytes
SHA-256: dd71f7c6f3829619bfac857e49c23d29bb865b19cd23b4fa65c7ff90e7b8babd
font_01_sfnt_off00013f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2E 10680 bytes
SHA-256: 0b0536bf6c85945ca5ba2dc24a75ccdab7d588bc2be62b5ae2963bb6fcaef3b1
font_02_sfnt_off0001579d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1579D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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