Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc67bba5a67d339…

MALICIOUS

PDF

89.1 KB Created: 2021-06-30 01:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f69314d4815f89c5c082778c8306110e SHA-1: f6e612b117ca50ac0c31fcbbdcd8243e41792376 SHA-256: bdc67bba5a67d3396cf9060888cbacb8b3e845a71d0a7d53d405adb2260bf47b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Numerous external URLs were extracted, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to distribute malware or facilitate phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://copab.tn/216mag.svn/uploads/files/vesifamamupuji.pdf In PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/cc7e4777809b07dd3da089eb083d59b4/vidudapobawijeporaselu.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/90230294466.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c66e1a3efa---ditirezuzebudixuguv.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/42007488221.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/15755794178.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731f6a01541---defenewevolug.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/rujanuvalo.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/kolodebomukibo.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/1412d137ad95e3f35f20adbc3dc6bd00/bupowis.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8ca27200d---tugasewi.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c082969c6---jawusulaxikogegalijuf.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mirosutakuzodulozabeva.pdfIn PDF document text
    • https://hgb.se/filer/file/wetivapunugunoxebabowivu.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/bemirasaguzoko.pdfIn PDF document text
    • https://fallsplat.se/file/wanizijobaruzuzodara.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa8d7567fc---32094495957.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c949b89f88---xakofavis.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/10c4c1aa851966117365c684c0fb1e61/nasovadavupawenonemevupa.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69991ba64b---vetetudewoxadopepo.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f28ed30fcaeaf002fe962779b93ae983/7415874635.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac15e70fddb---78568768700.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/c210b7155184f74d76b5d18180dbc84a/jibajaxegedajanajevim.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/peselixifobulumod.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/8367996431.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/zolibonarejin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=edges+meaning+in+marathiPDF 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_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 18436 bytes
SHA-256: 16a94eb50d04b8d70b22abface9f933f8ea14ac81d7803914e55c6ce9b762509
font_01_sfnt_off0001256c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D83 10512 bytes
SHA-256: b4db8d3faa7a75c4039b4c0205a0591a42ff073e4d5f9baeb20b9c5f4262ca77

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