Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc32c7b0c3fd058…

MALICIOUS

PDF

84.5 KB Created: 2021-07-18 05:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c1ad0f061d326911a516e5a9822895a6 SHA-1: 1bfafb193c24f25b3916ba0eeb0076afbe452a98 SHA-256: 9bc32c7b0c3fd058c7ec2652ad1b69de60064cc502389aa3b8a5d77d270c7309
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal being to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c5de0bf0f---ramobulovarikinojosuvo.pdf In PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bad0e7d246---lasepisilo.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/18340628906.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa837f0bf01---35660237483.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609acdf7a7c27---61200065282.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/jbh7lp90rn00p87cnocbmhqjsg/86076844247.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/72b028ea9cf1431504d9d48b0d865a36/71820621946.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074371302f97---96925149836.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/olujbnnkov5edk3g6q0dgu1eno/jitunepitazaferir.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/wobobobopur.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/74792938522.pdfIn PDF document text
    • http://www.xn--12cfj6cf4edkfa3b0bnvcc0ewa8fd0a7nth.com/ckfinder/userfiles/files/82531752470.pdfIn PDF document text
    • http://abnicum.com/files/file/95830158647.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/17458618021.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608545f7f2dd0---62545188121.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/dfb8928f65aaa86963d7009f38394762/zunobedexuvida.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/feee111de045f86a770651fef83f0ebb/10975563089.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdc54e7096---gedoragadosogujidumataze.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/31027549912.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/26737514899.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/bavivigegar.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/bipulogewa.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/rudunupofud.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee59f60a54e---34187462803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=interpretation+meaning+in+sciencePDF 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_off0000e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 10620 bytes
SHA-256: 4b3aabe97a776eaa54a222548012111ee9237c686ed1cd0d57107a2fa1981c51
font_02_sfnt_off000116db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 16936 bytes
SHA-256: 3e5aa86a7803321efd02840ccf32829da7185b13bd7d9420a31274117d6e92a3