Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42a33fe7a23406f…

MALICIOUS

PDF

70.8 KB Created: 2021-09-06 07:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a44a6fd9c45279fc99a6df83f9621837 SHA-1: 36f11a06a0e68acab7c1d22d036c5fd410e90311 SHA-256: e42a33fe7a23406f6ff734127e4dd2b4c9526d9664a6317f5cfce68fc6c70395
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the presence of link farms and compromised CMS uploads points to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zosezowudoral.pdf In PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e634f056b2---21706114142.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/bo8og48barldua7fomo27n38vm/zewibubakinapil.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/68748962929.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/dufuzeniliketasabuzaw.pdfIn PDF document text
    • http://faradbox.pl/files/file/fosezuzunujom.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/qg7rfk7crr6ajd7vkljrufunch/59551436822.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/sifirakajufuvibag.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bc35a39b4---61454591844.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/0adc09acbd9ce8bda230cdadd319efb2/zivefobe.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/tulezezoxijosaguruxiwad.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/94172227210.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/10170188111.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fikajepo.pdfIn PDF document text
    • https://basisangka.com/contents//files/81338643674.pdfIn PDF document text
    • http://juentai.com/userfiles/files/32819472379.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddf833b97f---6179903936.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/jeahd65cftdkg60ms5rp4e3vp0/roravasebe.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/nejubafujaxemusebudupiz.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611880360fe70---dabilisuto.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/ef75b2ae7e536b78eb8f075bdf548d1f/betofido.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/5snvp4lu01o32rufg0v0pm03fb/baduvuxinerilunudofuwer.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/60810587703.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/lanisinadul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dallara+f308+manualPDF 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_off0000b533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB533 10368 bytes
SHA-256: 2f3c16b26d5d229ea26697ae9d6dce668f599e3e9f83a11d7a70f418e8857a19
font_01_sfnt_off0000cc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9A 16020 bytes
SHA-256: 91f03487374b64e5c96892f60ad657e215f4732546e412c5ba3b4bd90e052848
font_02_sfnt_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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