Malicious PDF — malware analysis report

Static analysis result for SHA-256 7985a2d257dfc197…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 18:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 845be05ba5c46083021988c402e86237 SHA-1: 32c49a3291cf0a10b6802e887e3beb93efc1e047 SHA-256: 7985a2d257dfc1972ea67000e1fc1da761dad5337fe08b3f4698f37f7e2803ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, hosting numerous PDFs on compromised WordPress sites. The URLs point to these compromised sites, suggesting an attempt to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2e1e59ef64c546e227a2ecaa84f2d770/sujomesegogagunowa.pdf In PDF document text
    • http://dancedynamicsla.com/clients/38740/File/mewebofubifovoxibo.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/gilexikizixadekobep.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/zedepamuwirixizujul.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/31814496100.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c468450e2689d57137b36aa46652c73a/vemukedunozolisogisumi.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/wobovaxobiwijebi.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/wugazubivazido.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbef8ae0b0---88460226030.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/iqdpvn9gfrgeheu4ah53ifhb22/rebob.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/raxekijurumelokajeduritaz.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/66473293443.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/21147199190.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/temokuriwalur.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/25237963279.pdfIn PDF document text
    • http://scan3dsaigon.com/upload/files/96163650876.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/99559864586.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/15113784927.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/em82jjicfpcrrduc51tqq8shce/15959997876.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/48047448481.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30255016637.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/q7lsuuh85d0j2hj2r78k49ulid/kawataxinimeziduxomorebib.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/lir3bmnsqg1kdj07j4i6qhlof1/87304262565.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/nuvovuf.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/64331288262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=blocked+by+frpPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/063776f0c19d2f9159c7ee123475d35b/tijawekekememojuxalozu.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_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 10388 bytes
SHA-256: 29d2606e27b7b776332d298a3812d670e708988032d17da4329dc2778c0bd449
font_01_sfnt_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 17440 bytes
SHA-256: f3929810abfe77a6253f22359ae1ce2a9b07b963c42746b133e57a6d1f687ace
font_02_sfnt_off00012a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1