Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62479d3eb4d49d7…

MALICIOUS

PDF

72.1 KB Created: 2021-08-10 07:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 6c322e0e952cc6ac93310c55092ccb14 SHA-1: 753236ca01a2cb3fdd4389a6af71725b13370485 SHA-256: f62479d3eb4d49d7572583523705bb89d07d9c51ce0098eb123f97a1a9ca7ceb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/6c221ad5e2b9cfa76107bdcd27ba91eb/68318189368.pdf In PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/r3aidf3q320srn9ei4mdbhkl96/72649478748.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/7109577042.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/0j5gun3fv2g8je0vb9basr6e24/50199650728.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44682c413---53418453292.pdfIn PDF document text
    • http://classtool.info/upload/files/43579463022.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a9afdd985b1---gexupobesefivuwi.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/zabowedikafovotetefolur.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/f448c4cc4838cef5c9f135ab73daf407/bomubatuvip.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/fitaxagakedojavo.pdfIn PDF document text
    • http://p-energo.ru/content/file/39936252449.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e383a4da92---zadawezofirememi.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d873b983047---25130946872.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/natezidot.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/pexetilidenalofexurimazuf.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f116311a3---wuxobepiparelapufeti.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/gppqg3paf871deru14janf6p90/mezupizetorekove.pdfIn PDF document text
    • http://capital96.com/userfiles/file/86761332140.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8fa51afc0ab21717bfdee6f69097e428/64260393939.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073713a05f09---tuwubazepiba.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/20249171880.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/32728423599.pdfIn PDF document text
    • http://leguido.net/files/vowofilivasowejuwaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=enter+the+warriors+gate+2+full+movie+123moviesPDF 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_off0000bace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACE 11240 bytes
SHA-256: 469f121e41ba4692838a744c0863047de9156c9b28ef5c2658a1d083ddb60600
font_01_sfnt_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 14324 bytes
SHA-256: a43a51420f9efe20592474fa6147a876f213ae919b64d62e0ae8778001043028

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