Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e56d07582475a1…

MALICIOUS

PDF

216.9 KB Created: 2021-07-30 08:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 860d10be740576269acb5c44dff022e7 SHA-1: 470288dab0f7c96392641b01ae207984d84627b7 SHA-256: c5e56d07582475a16fcad6d9f2a50378de02bb9baf6f890a34325787cb00c7b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute further malicious content. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9841

Heuristics 5

  • 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.
  • 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://oxigensupplies.com/shipinc/userfiles/files/18767589306.pdf In PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/7ghddd2niodui1ao55gqpcsebm/51213748711.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1720e51f5---49996616424.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/34010765236.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/roselarasosepinuberere.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aca19f081c2---mapawoxijetaso.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/42531592204.pdfIn PDF document text
    • http://rsst77.ru/upload/files/seziraxidisonuguk.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/67002842886.pdfIn PDF document text
    • https://masihpt1.com/contents//files/53936708353.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/rikanubenugodonore.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/aa6baa31df596c020987aee38fdf6c0c/sideropusodek.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/355918549173f0563f8050c54ce1363b/40596372967.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1196e1089---34960815707.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb31944460---32464859957.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/78462029827.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/sokered.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/41438348031.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/47940019543.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f5bc94874aae7658fb9a96986c0358e7/48838048751.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/72586469597.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2eb2b882c---siraro.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/93584696443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+create+wealth+investing+in+real+estate+bookPDF 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_off0002f0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F0B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000308c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x308C7 19036 bytes
SHA-256: d4e15889cc5b6c10c872f5d34862c3d1ff70467ecf230c24f6036d0ffa19fb61
font_02_sfnt_off00033b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33B9E 10884 bytes
SHA-256: 2eae3d79eb6776baebf886cedcf52f16df7aa7e18f95e94a4fbaee0d0c85815a