Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4405a22a9f762f…

MALICIOUS

PDF

83.3 KB Created: 2021-08-31 19:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: b47a7ec139519138c17e9d7147039056 SHA-1: a6103af8a70af684fbc90f36e26e676e508aa455 SHA-256: bc4405a22a9f762f7a33cbfffbc70d10a3d2448c751dff3a4a235f8d38e566b4
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://designgaleria.hu/userfiles/file/xegubukipuxozikimef.pdf In PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/612ee8d157527d2d98777bb5e1b65405/13906981407.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a25508f4a8---senafolaxumufadefaginari.pdfIn PDF document text
    • https://badoza.net/userfiles/file/67804591754.pdfIn PDF document text
    • https://kimcert.org/E/file/bukasupab.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/gebezevupegewuros.pdfIn PDF document text
    • http://getem.pl/files/file/gutoxolifomuw.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/85817708212.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2787479ab5b2a98d8b7b491b88808a20/44496295873.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/fipekimo.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/89146197455.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf246e90b---70215885942.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/73496147558.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210819074408.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afec35ebb7f---vapumalurutukuzajipudom.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/5978130b893f91d19415e5013d5d4f41/67752533821.pdfIn PDF document text
    • https://southafricapools.com/contents//files/81718600457.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/tidigeb.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/piwub.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/33188320969.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/94a0959af1906babc7ad5470ff8b7fa8/66008902470.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ff91c929d---48539536990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tows+matrix+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37A 20224 bytes
SHA-256: 9c785ba3ab136112acacdb0ad7e5edb83c0df4ba881c4d24bff64825e0d9b4b8
font_01_sfnt_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001106f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106F 10556 bytes
SHA-256: 6eff880a9195d5dc598bf60429156b201fd6efe559c6970e43813518d46984ae
font_03_sfnt_off00012894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12894 16476 bytes
SHA-256: 737f420f7f47b8cca9661930129ee15e29893532bacf603d27c66059899cbdf0

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