Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2b82f3d8cd590c…

MALICIOUS

PDF

89.2 KB Created: 2021-09-02 21:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 63425354e3575363d369211da0e1cc5d SHA-1: fe0f0281d5abddafe40dfec944b7847c63a21fbf SHA-256: df2b82f3d8cd590c70d35e530ee5ee26ef2dca1afbb1d7ef85b305bc121b1c36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript, though not explicitly detailed, is a common technique for exploiting PDF vulnerabilities or initiating redirects, aligning with the T1059.007 technique. The overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://coretry.ru/uplcv?utm_term=%D9%86%D9%85%D9%88%D8%B0%D8%AC+%D8%B3%D9%8A%D8%B1%D8%A9+%D8%B0%D8%A7%D8%AA%D9%8A%D8%A9+%D8%AC%D8%A7%D9%87%D8%B2+%D9%84%D9%84%D8%AA%D8%B9%D8%A8%D8%A6%D8%A9+pdf PDF link annotation
    • https://menu2uplus.com/images/file/mipivizoniza.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/zuxixakolitareluruxu.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/pojedimisavaf.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f3c87ccdf---velumiviborelubafu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609496e54ab48---dunefetofenakeladot.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b74accc68---makisutajisuliboxexikopa.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/59262916132.pdfIn PDF document text
    • http://ciskmv.com/css/file/bubamokebe.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/80981670577.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/6bm63003t0bgc9ejm9kfok8g37/xigijabirujidinabowowip.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f290d125ca32c0833845c419d1b0fe2e/43871749984.pdfIn PDF document text
    • https://argumentua.com/i/file/96898614979.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/majuzar.pdfIn PDF document text
    • https://etadelloro.it/images/file/tikujumewulis.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/mujejajoxuzanila.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/72363133425.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/97517937790.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/96262223691.pdfIn PDF document text
    • http://korytnica.net/data/files/50908490136.pdfIn PDF document text
    • https://norservis.info/files/files/pivipurejisolizavufomuvi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ranev7952163oj7ieckpir2v2/retadatu.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/berafobipilukarizoluv.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a88df098d6b---26140112759.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/jokikojuxafigilomenu.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/lazifidasedafirevuwapox.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00012961.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12961 23704 bytes
SHA-256: f964951bdae890287f5872931731b5859e9bef04f0d251ed2365cde93624b6e7
font_00_sfnt_off0000c514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC514 19272 bytes
SHA-256: deafb091fa8138e3c610fad472e0d85ded01ed1b6fb0e878ae67647c4bc08557
font_01_sfnt_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 18868 bytes
SHA-256: 4e8053e1314cea37e189c722ac4478bb90d9ce24e8d68dee99e96a6dfad10bc6
font_02_sfnt_off00011583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11583 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724

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