Malicious PDF — malware analysis report

Static analysis result for SHA-256 5207128c28e177a3…

MALICIOUS

PDF

70.6 KB Created: 2021-09-20 21:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba9d158bb48ff930c35a8172a40a0eb7 SHA-1: 4caac03099d2c2e82f58dc7a850c8e7467882623 SHA-256: 5207128c28e177a3fa4752c9a4e7260d76e6898e80e3353855d74ba176718544
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious link-sharing pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://offerseir.com/basefile/offerseircom/files/51725846383.pdf In PDF document text
    • http://mcdanielz.eu/files/file/vovogujabazomijilixo.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136ab1c7194f---3837858636.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/55803496919.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/2e500fba2bb74224c32d7eebbee5676c/63232933685.pdfIn PDF document text
    • https://podimercrm.com/img/files/nixokazaxatawuvigup.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/45640570585.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/bokejetiwij.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/28031889189.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/vigapudepimaweban.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/giwurujibuni.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/wubolewadatenamixanakuxa.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/83310336980.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614068ac1e4fa---86470926820.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/s183jpeasb2r1laur93jedh2ok/fufejurovezumoxawutubugiw.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/89075652327.pdfIn PDF document text
    • https://satesayap.com/contents/files/gupojazozexet.pdfIn PDF document text
    • https://patc.fr/imagesfile/pubopebibafobev.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/46556710310.pdfIn PDF document text
    • http://efrex.cz/files/file/45634584085.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/h4apmooh5j9dk8sc1juoukrqk0/28141445860.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/mokibupavolakiwaz.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/rorezapewa.pdfIn PDF document text
    • http://client.diffuse.info/files/21758466083.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/46617021573.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145faea57140---bolatasenudopofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=think+and+grow+rich+pdf+book+downloadPDF 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_off0000b621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB621 10784 bytes
SHA-256: 76457e81f16b054300f91d9164a0a6aac0edd788e493aabfad2f10bd79343f6c
font_01_sfnt_off0000ce6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6E 14480 bytes
SHA-256: 428e6563adc82e0a5b1928288df51d1b21ee63fec0a7b9cf09a171562e92478a
font_02_sfnt_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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