Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcd6273efcf9efc…

MALICIOUS

PDF

85.9 KB Created: 2021-06-25 23:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1b71e147f168fa6308ab1da982e8dba SHA-1: d87460ebb2dfd895377ea17d99ec688461597c7e SHA-256: 0bcd6273efcf9efc32d337e11e1d6feb5292a52f14a85964f79ad1e83d5261fd
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. The critical heuristic 'SE_SECRET_RECOVERY_LURE' strongly suggests the document's purpose is to phish for sensitive recovery information. The presence of numerous external links, many hosted on compromised or disposable domains, further supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://dolmalatrek.com/userfiles/file/jurasujesugevuxo.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/d64d171ee49b8d2904a66e94b63d24df/dizixujatatavokuveti.pdf
    • http://mtecommerce.it/public/news/file/30797911356.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/84f08b686431b6829bb85a85411f1dda/zevaburisuxudat.pdf
    • http://chinahongji.com/d/files/81106840605.pdf
    • https://serini-cloud.pl/uploads/editor/file/mumelaxirew.pdf
    • http://beiks.info/public/file/lokelegakinowa.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074353a4174f---mamoguposigebare.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/02723b7692d0265860b0c74a6fa064f8/95899389983.pdf
    • http://aisef.org/uploads/userfiles/file/file/biles.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16099d32bb3554---46497214487.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a68619b40fb7d23a1739c8427baec28e/mowotoxor.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d410d357cf9---98047307109.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3ce2c0af15867eee49a59bf207f6ae44/8158318996.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e49558b4f2---reraka.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5a6a81928---lixuzovetabi.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/l8n6shh1ssqcpjco3tab78le36/74672088977.pdf
    • https://atraba-holding.com/userfiles/file/36013662305.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c140f5b0009---57495490655.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7339c955c4---najeletusudodogu.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25166486a9---bapitizumozerujetoz.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54a7b21d6b---vafebiporejobirefaw.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160994dc8a7583---77468937138.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+print+secured+pdf+files
    • 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_off0000eb9c.bin
d62b47cfd69a128882eb7e43a537a4ec928689f168f8ec22675794e4d7493b8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 10628 bytes
font_01_sfnt_off00010412.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 16792 bytes
font_02_sfnt_off00011c24.bin
d9918179c0102d308ace0cd6ad51eebf46081016ba87424de2e32adb7b4085f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 17348 bytes