Malicious PDF — malware analysis report

Static analysis result for SHA-256 58061fccf2b9e044…

MALICIOUS

PDF

73.6 KB Created: 2021-09-01 21:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f25912426db9b7cf80ba210286240fad SHA-1: 10248845a8e08ec4e4cdd55ffc3a92b6fcc7a7bc SHA-256: 58061fccf2b9e0442ca02f112cb4fea03e663a975a579b6866cdfd8c80159080
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised or disposable hosting domains. The primary purpose appears to be directing users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://bukharageorgia.com/sites/default/files/file/meponitagoso.pdf In PDF document text
    • http://xn--j1aii.su/userfiles/file/rolowadekubimiresu.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sojiwawibo.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affe7ca6b32---pulokujafenidobimurip.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/xatawamanubuvogisesin.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/rukisejapafulel.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/95030551243.pdfIn PDF document text
    • https://angkalaris.com/contents//files/gofugixilotu.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a83ac51ef16---nowokunizo.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/754a504ffffc95f0534e96234a5f4cca/28689406103.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/lufesonof.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/pokonexugonefu.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/32956842158.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/wiwulemimamizapugakuxame.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16076b733b7279---xajew.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae88fa3b188---gurelim.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c188ab92fad---74259522163.pdfIn PDF document text
    • http://veejaytechnologies.com/userfiles/file/5950719988.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/98197626040.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd812ba327b---19471180923.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/25447902857.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/3250806644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=convert+microsoft+works+file+to+pdfPDF 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_off0000be3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3B 16152 bytes
SHA-256: 9b22cc50ae39be69cb731791c75ab33861b0d96d85ac8f2a18cee6355c091b04
font_01_sfnt_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 10892 bytes
SHA-256: 22dfd6e230a352175e9bf3804fd5985f648a7716035dc92066c6f2fe7c085160
font_02_sfnt_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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