Malicious PDF — malware analysis report

Static analysis result for SHA-256 b776fbb761f1587c…

MALICIOUS

PDF

84.6 KB Created: 2021-08-16 13:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 72f2159ae18a2b4f770e97bae94f08b0 SHA-1: 20740f815355b98f174ff670e24d47505e82a027 SHA-256: b776fbb761f1587c42c543f833af29f6b9832247c21f1647a4dff51dca1d32e2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or further malware. The presence of PDF-specific heuristics related to link farms and compromised CMS uploads strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/77lio0u2nmgc5jj036cotocqoc/59842584249.pdf In PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a79c79ea765---13861758202.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3ecd53290cf5a6fc40d0177af902a3fe/75071080028.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f2e5dccff---navojuxajikelobu.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/vabemu.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/dokusagotalaragusisu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119781d6a79a---8212641006.pdfIn PDF document text
    • http://huiking.cn/uploads/file/130451474651.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/68716718556.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a866134366c---9364580028.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/pafugorol.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd53e82eebb2057807b16e60774d6dda/95081032866.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/54034972743.pdfIn PDF document text
    • http://benrassam.com/uploads/files/54502862221.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a15514d316a---73596531539.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/f34996cdc3d13c51c05f293229c11690/zubuvebimoxokatutipo.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/50014289397.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/25979919920.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/3db15ef386d7d573b451860a512e9107/23609944284.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/walumonopinodalivamuli.pdfIn PDF document text
    • http://areaarchitetti.com/userfiles/files/55104539073.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a06194847f19895ce1026576ecf88048/96685061128.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/7882852566102d4fe6ab86.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/zemoripizebivokisetapux.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/rozumipobovekazawaguxozem.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/genirorivonutoboxigej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=where+are+prostitutes+in+gta+5+locationsPDF 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_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 10880 bytes
SHA-256: 757d9cd89f25760b4b05695b7793c0860e945e3c7e1e4112d8a85d153cd0f718
font_01_sfnt_off0000ff8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 16948 bytes
SHA-256: 11ba47869fb7d4fd8150ec7fe26c1cac2ad6e369d0ae0977eae8aeca682b146d
font_02_sfnt_off00012bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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