Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9bf5bc96c313d7…

MALICIOUS

PDF

90.7 KB Created: 2021-08-09 11:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 439b389ba1644ad7bba56a91bcf4fc4c SHA-1: 59818d13d24461da9f67e45dd8d3beabba28b224 SHA-256: ce9bf5bc96c313d79d23befbf03bc7302190d1e75176310781e35bcaddba7c8a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the primary indicators are the URL structures and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://assushop.com/userfiles/assushop.com/file/kigepibugavofisixunux.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607291f42ad62---fuluganigoburetonunemod.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d32a758588---87565535123.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f87eeed56ec08e5a0372136b3bda7a6f/35757037151.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/balubuxewaba.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/87179722539.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/44164015609.pdfIn PDF document text
    • http://teifsepahan.com/files/file/bokiposolafuxeveduto.pdfIn PDF document text
    • http://mqskin.com/luutru/files/98289523141.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/vibenazajati.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76717e135---junofad.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607d354d985af---pijabe.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ae153d53b99dd675cb7622137ee4027e/xuzupelukowusafafow.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb64a869135---mokuxalop.pdfIn PDF document text
    • http://coffee33.ru/archive/file/pugazoragusuviwelosesare.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/fbbf3e05437d2d6025733541383d0672/dafiwotebe.pdfIn PDF document text
    • http://sooclose.eu/upload/File/43440178240.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/74999593747.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/nuxekubuvo.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b65d09e3db8---16954988267.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/ripulivetebivume.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/xumudeb.pdfIn PDF document text
    • http://eastbrunswickliving.com/clients/77672/File/gudafitodulematajogowuvug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=frases+e+imagenes+de+dios+para+reflexionarPDF 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_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001152d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152D 10820 bytes
SHA-256: 1103533f7767c50ef1481fab49ff83dbf867226842d4dda5b64d3c248ce9784a
font_02_sfnt_off00012dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD2 17408 bytes
SHA-256: 17e6b561cecfb90069ba2a1fd0cb71178992f15a75a1b9d4e1854ec323a24103

Open this report in the interactive analyzer, or submit your own file for analysis.