Malicious PDF — malware analysis report

Static analysis result for SHA-256 717a069184d7d374…

MALICIOUS

PDF

70.8 KB Created: 2021-09-17 01:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94dec5c3a535683f60a74775f4ffaa0c SHA-1: b25c39d937634871e5b93375e168eeb6526df8c9 SHA-256: 717a069184d7d374eb23e39b74f8b22953c0194bf48310a59463caf8337ba142
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised websites or disposable hosting, likely to distribute malware or facilitate phishing. The presence of URLs with 'crack version' in their query parameters suggests a lure for cracked software, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tw-echen.com/uploads/files/202109120356574894.pdf In PDF document text
    • http://worshipedia.net/sites/default/files/file/zurupoxurivinoguje.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/60094671144.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/19308574233.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/15ai8biaaa0kp2f57mok3uldl5/2260362003.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/tavotirobotudofovadus.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d593184b0---turonevixuzowanogixusesa.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/5d8bbc688fa90f44de1ccf06cb3c05eb/tisutakivuzi.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/fanurig.pdfIn PDF document text
    • https://ghnservizi.com/file/34219381192.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/96276424539.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/68440757477.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/lm203b44m7a5sjj1r89rgte955/47617213199.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/jewabuxakonoligevenulaka.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/99126109372.pdfIn PDF document text
    • https://deepex.hu/hirek/files/9802077720.pdfIn PDF document text
    • https://agros.net/uploads/file/59026469357.pdfIn PDF document text
    • https://durimawar.com/contents/files/gatabobakusadab.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/44227811040.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/26417296320.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/soxuvabokapuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=asphalt+8+crack+versionPDF 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_off0000b294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB294 10820 bytes
SHA-256: 1052f4accfeffbeaadba22c34c77c33ed7e170e5e16b9d861c6e5a0f400e58e0
font_01_sfnt_off0000cb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB96 16580 bytes
SHA-256: 1295d9658c6d09d0bd4d68c0e624de8018b6c92e0e296cf42917f37d16f0e929
font_02_sfnt_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1