Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ccc7a0f30cf14e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 11:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0b0d8971295a9f440400fedeb7e78eb9 SHA-1: 7957becf882fecfb7769c9b9c7915fcf2b8dd627 SHA-256: 61ccc7a0f30cf14e25fa57dded9f7ed4dba3dd7910bab5d0a07664eac2d08ef8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://carszana.com/image/upload/File/85685711559.pdf In PDF document text
    • https://muacash.com/webroot/img/files/60019967667.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/43253200204.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/cala5mf7fbnin4e8589oluejab/gigonodariwo.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/99355041042.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/gejozimalinilexisago.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/nakor.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/99776051016.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210903040959.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/94103251118.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/lekofubixosuvir.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/347cbf6a7fd9981a735b306b8f10f9ab/53204391064.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131899174ddb---17644246967.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/90742754088.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161340335dd443---95858944444.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/kupiduwa.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/47060740463.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/64316276711.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/tonasavozudedexirawiv.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/mosuweruvaguli.pdfIn PDF document text
    • http://gibisch.org/files/files/zemukafopivekemometix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=why+do+ads+keep+popping+up+on+my+android+phonePDF 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_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 10996 bytes
SHA-256: 9da7671c1c1b5fa186903115725e60cd1fa2dbb484159289614890b9c7a6b8ca
font_02_sfnt_off00010b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1C 17616 bytes
SHA-256: 2c22aca96e68707a3385edb8aa54b3a59ba0cdc4ecb2dff795f8f92f04f0deb0