Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0d38a235bae51e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 10:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6fbe7b6ac8ccf3e14d543c5372ce437b SHA-1: f8fe39044521e7d069ed826afa475b1abc5ccd15 SHA-256: bd0d38a235bae51ebcc832e6a9ba69ba3856ff10e6ff9656f046fad3368bc7b1
196 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or credential harvesting scheme. The presence of a 'Password-protected archive handoff' heuristic implies the PDF may be a lure for a subsequent stage, possibly involving encrypted files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/3o1jlvrak6phbs77r413ebdl7a/wetobejuguterifar.pdf In PDF document text
    • https://aathichudi.org/userfiles/file/437277894.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1610921e95c250---50099934586.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/29779779185.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/3d4v5d9q8aeebfh0o9m2dfgp1m/48286589872.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/13j2ati7053dncd9ggej0jndul/jejim.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/99b37389629c676b22651b717a034af0/sesedus.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e86e2288e---85032183690.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/mejikuvewibegudodini.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7a362cbd---janowisuzezexewixurewa.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/90669361754.pdfIn PDF document text
    • http://wirheiraten.de/images/file/lafulaxesazilesesob.pdfIn PDF document text
    • https://masukpt1.com/contents//files/17068737421.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cc44a72d2---65710626886.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/kadupogukuxelana.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/wavagijatiboligoburuvor.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/larafojivenasefobofu.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/14796472424.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161250a09ae83c---lijugavewe.pdfIn PDF document text
    • http://zimmerei-possert.at/bogifunemiji.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/861a60253f475ec471d881e2f750a3dc/revorigepulika.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210624215031.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/dirivepusopupekadiloboxo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b5db61914---56653092034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=editable+pdf+forms+onlinePDF 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_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 17680 bytes
SHA-256: 27848125cb11b2b4856400dec839d75a15205109a0f341414a6ae9daa6aa8ef3
font_01_sfnt_off00010f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 10780 bytes
SHA-256: 8a9dbc52e93335c9eb958f6b6a311d939b78890a974e733d652491d70d552234
font_02_sfnt_off0001281a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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