Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c56ed91779beef3…

MALICIOUS

PDF

93.3 KB Created: 2021-07-03 03:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f683e071d6a2724776a62a1a86a60b33 SHA-1: b752a2550b466761fb52a23781cf1d79f17f52f1 SHA-256: 4c56ed91779beef3210680e51d3f8af35df815ce7743fa27d1e688b9845b33cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://contabil-fiscal.ro/mm/file/jezopofenatitetegapabezo.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870ac37389d---jefogem.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/uf1l2qkdnch2fvn0fup2glthie/79899867697.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa2e60ec1a---budonazigutimaboxogexir.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/56d83258dc5d573e3b8f26e6cb519728/94493937960.pdf
    • https://dolaodong.com/userfiles/file/69642575385.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/82vqkaete2uvltdfacuk0gp26m/21535830482.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/befutotu.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ujbsqvqp51bu7tu2c73ibi06im/kadune.pdf
    • https://tkquiz.com/userfiles/file/mapomokasox.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/43929788792.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098948a5b1ca---25639364248.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/5g3nu27djrbo1p28e9u13hqagc/58359031979.pdf
    • http://beautybybelief.com/admin/images/file/67566131059.pdf
    • http://faradbox.pl/files/file/83090467261.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b6633441e---novofofikevobuxotemez.pdf
    • http://jngf.cn/files/file/molekevatajalovofixamel.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160726747e383b---8334201627.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/verudepisegodatigu.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2269aa1a9---60223955981.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700cbf08f91---rujabusilisuna.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e703ae89---tokitezuzegisiwug.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/41f4088c904ab963e516520dd0719562/gosolenifibixuwodexanorod.pdf
    • https://kurek-rowery.pl/user_pict/file/3213662661.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a6138f8f66fe16cfca4b1ca5f60a69f2/kuvenexuxegazeti.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=home+budget+project
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f515.bin
1c0739db4eb0b5f1b04abe1abe35078c828a23e99148b1d6054e3e2d4bf0d1de
pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 10644 bytes
font_01_sfnt_off00010d07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 16792 bytes
font_02_sfnt_off00012519.bin
e276296c2dcdbd2a7d71d7987beaa020397372a8062eea097c217e6be7c00506
pdf-font-stream PDF embedded font (sfnt) at offset 0x12519 17020 bytes
font_03_sfnt_off00015167.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x15167 16312 bytes