Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6fb3c341f63241…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 19:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4058b4ad7087de0269b062ead587de0 SHA-1: 7b8fb727347d3c20d498f9023839d545ed6a1ec7 SHA-256: 9f6fb3c341f632415a0da1103e0fecfd91e6e674074cef0324c90f7c50e47d3d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=house+of+cards+streaming+free PDF link annotation
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/36001660462.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b82bcd267b9195f700d7c34ac8665fbb/50129248533.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/vidunurebamijotute.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/97438098569.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/bipulapeseb.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/50217699674.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210927_131606.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/garijejojitonu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132593f2d741---popuwevomekok.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e140080847---zigesonokamudirumi.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/seruvotafijasidujopub.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/koteviju.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/79177658034.pdfIn PDF document text
    • http://wamer.org/userfiles/file/buregapiluwamiv.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/9324240521.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6a465218eaba50494d2769f5bd5179c/42547960751.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/188e4dea8e4eab28bf5ff8c1cdbc53be/donikimofawatisuzuko.pdfIn PDF document text
    • http://ingatlanfelugyelet.hu/uploads/file/lozimuxiwefimewamimat.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/jototimokekusolegiwalev.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/jivudebomenixupop.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/kobikekopofivixadile.pdfIn PDF document text
    • https://arendic.cl/files/jidogimomesaramanetuwodek.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/wopolumagonibipakazop.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_off0000b168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB168 14792 bytes
SHA-256: d184b11806dfa787003218597216b4b25360e74d2016f0b8beb6f9b49576ce13
font_01_sfnt_off0000d6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 10864 bytes
SHA-256: 7bfc59ca3b382bd55a787413bebd27bacfd06ff73b830a64a75f4ed943c21246

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