Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf3f6f9387354c7…

MALICIOUS

PDF

89.4 KB Created: 2021-08-12 07:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df9045ae6450816429f3b9597103461b SHA-1: 0c530fc81d56704e01551ff6c44e7fffcd85065c SHA-256: 4bf3f6f9387354c74b45f807a54c612eba51f95790a4e9edd22cb8d64702e21f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics indicate the PDF functions as a link farm, directing users to various compromised websites and disposable hosting domains. These links likely serve as lures for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=jim+collins+good+to+great+quotes PDF link annotation
    • http://quincy.pl/ckfinder/userfiles/files/jubuguko.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/q3l2sf34ddk5nmupeasi5h6v7s/11956157754.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca90c983d---19260970234.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/zijajifugeganufusoraxovo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/d62p8opr7aa6jlhln1hbr7f547/siwesupota.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/xafunigiwebaripu.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/9825641148.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/724bd1d96e79a9c89763e18887c2904a/pajelex.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/dce9645a374ff2ef20fcb71bbb4310e0/jofuviwewomolerabu.pdfIn PDF document text
    • https://marosme.ro/hirek/file/zopipuradivefabusodod.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f0fbb9b505f---gisuduwulunovu.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/punuvuloludopejip.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bac12c19e---3942231108.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/eeb765141d175992c9bd1f6e87ef1482/99900166031.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/memak.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/70618151763.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/kazijumizi.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/vovejat.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aca2982c7fa---zawuzatazo.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/28259912290.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/9137161109.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/veloluvekinanirozuri.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_off0000f75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 10952 bytes
SHA-256: 44bafa86f842440689433be9ee1c10a7e6f5af892c4e908beb61693e70529f74
font_01_sfnt_off0001103d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001284f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284F 17220 bytes
SHA-256: 7a2fc77d8e70593b6c6cf96dc454e71ab71aeb762bd06ab6b1bed0d3dc2c43d6

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