Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcc37a78cedbc84…

MALICIOUS

PDF

72.3 KB Created: 2021-09-06 03:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5d7da31fa7d4fc0171c38eb6f79afbf SHA-1: d65a9741aa7c7b1867439a0a2a4103da7afe9f89 SHA-256: 9dcc37a78cedbc84d96c243fc16c2b9358e8c567cf33f4dbcc1b5ca39fc15eff
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, distributing numerous URLs that point to compromised WordPress uploads and disposable hosting sites. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://medvor.ru/uplcv?utm_term=how+to+download+nexus+mods+manually+fallout+new+vegas
    • https://khotelmarket.com/FileData/ckfinder/files/20210603_F32E4D650E12320F.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/jfk8p3nulqjcj6bqsdmha0r3m2/revadefulisi.pdf
    • https://armagedonspedycja.pl/files/file/74954181068.pdf
    • http://tamlaproject.com/userData/board/file/79997984862.pdf
    • https://campermagazine.tv/public/file/80532916995.pdf
    • http://fskyok.com//uploadfile/files/29928718896.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c482e73bc97---modajumimodasulimabudon.pdf
    • https://badanie-wody.pl/galeria/file/dejelijulufefegibu.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a26d2bda---gafepikuvojifofubomis.pdf
    • http://driver-jazda.pl/upload/file/21555912447.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609d50f379e87---zavupuf.pdf
    • http://maekalocal.com/Maeka/UserFiles/File/binapinej.pdf
    • http://greenbrier101.com/userimages/duzasowokufoxapafikisi.pdf
    • https://biroestarsa.hu/uploads/file/57158319869.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608447acad286---84025923954.pdf
    • http://circolosilverblufitnessclub.eu/userfiles/files/memodojarumopebipe.pdf
    • https://dbjadow.pl/attachments/file/59991958776.pdf
    • http://botosani.ro/img/uploads/file/xulovuz.pdf
    • https://brickzoo.it/file/vifax.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1efe653358f484f9bdef978ffa378f29/53375511670.pdf
    • https://curvy.tw/upload/files/fonog.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9404b845d146f2237dac541b69ca3acb/tomenujeravegedepajipunem.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/c16bc4b82558b7d551e8630222c391b0/mitomafaberis.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104ac066f82f---81777932535.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b788.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB788 16792 bytes
font_01_sfnt_off0000cf9f.bin
61b718a9b5d4186967b002cda5b67552e70a01c4b143a172d7ee2ea7adff2c0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9F 10964 bytes
font_02_sfnt_off0000e8f4.bin
707e2aa9b0d0de3af9b04d597d62db6ba65b63595971c1fa1837c287158d2343
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 16468 bytes