Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1c7b887574d59c…

MALICIOUS

PDF

117.8 KB Created: 2021-09-08 06:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 61320c6f1a8556e29d8bf8c7552fe994 SHA-1: 0dd40c2cf3f55c21fdaf41f15d73389dfcef53ec SHA-256: 5a1c7b887574d59ccf8d85f8ab917c02c3c940e2c2fb2ee7e75ba0dd6df0eb2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Numerous heuristics indicate the PDF is a link farm pointing to compromised CMS upload storage and disposable hosting, with many URLs containing 'utm_term' parameters suggesting tracking or phishing campaigns. The presence of embedded URLs and the overall structure strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pixomot.ru/uplcv?utm_term=bayesian+probability+pdf PDF link annotation
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0ea7dfdd---99368804995.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/zolewatitazidosejovobasus.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/53153895068.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/vilovajejakabigufuweg.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/36639702383.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/kujizikigipigixedulox.pdfIn PDF document text
    • http://lucann.com/Upload/file/mapusidaw.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1a2624c49---79816546183.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/nodelapekugapamakanol.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/1c09gvnbs119qmutoe2et2gigo/jigerebug.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/27308295190.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/163bacc5a1f8bd915153f644e893340e/ropon.pdfIn PDF document text
    • http://deasreunion.com/clients/860224/File/24045795224.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0756c60cf646c974a4e8630b598ebbc4/3476397665.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/sejize.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16077ffd5ef1fb---gatusi.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/be4d8c7778f5d1abc34db73b580d0616/46114633423.pdfIn PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/mejalekifopa.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/27230860383.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/7ae3sgpi5e2n4nmvji3b03e4g5/gamokado.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/20227615682.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16071f488d2e68---koxig.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a8e479e0d---geraniwote.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/depavilokusitewej.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0c171e5ab5d34d44669e04bbb64c80ca/34561140094.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F8F 10796 bytes
SHA-256: 6f0d117c3d4d31b80654a79cf54f9ef703ead38997cb342e116a1a77c5d9db48
font_01_sfnt_off0001785a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1785A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001906c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1906C 21356 bytes
SHA-256: f1b0c6d8c780202aedc8cba64508fbf0dfdc716b00ba06c64fdd186f96e0078a

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