Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f36406d464c3bfa…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 09:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 63e17a7ff00af2d39dac6c71e318ede1 SHA-1: 03c5f55a2d1623afb9bf150e266996cd8639fdd1 SHA-256: 7f36406d464c3bfa49121f7ff6bae33e7752935618ae9bda120f8d61ecea6374
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to WordPress sites utilizing the 'formcraft' plugin, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are part of this link farm strategy, likely leading to further malicious downloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b008b82694e---fabaleragemujuzipi.pdf In PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f8bc2e58f---tokikojigupo.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/7adngb4fmohfdaqsrk7mjf5hq2/titatotajalaxol.pdfIn PDF document text
    • https://arerp.kr/data/file///9902050824.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/gunibil.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160986de60445a---21946743012.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/72092122984.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160baec65afbc8---65135923088.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/7d2355083de5418bb465ad98b5f3dfa7/45831628070.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/vubavomemigafiruk.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/77986071203.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608968c290196---16354561938.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2ae5652b3---pekegiwababupitepakukinib.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/682524b9606c34afd8c6bbee365cd023/soleranokememapuj.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/74396171355.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e27315f52---kiratijifanuwilakinedo.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/vivixaseseridow.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e430156959---suponuge.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/gurizatiwoferunixesuwok.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/paboporovigoboma.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077dc5e850e3---90115617988.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa40d9425---zulumuv.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/msvg04q1fmao9dm1cnt6c5raib/bagemadapozigusugesufolip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=roald+dahl+james+and+the+giant+peach+book+pdfPDF 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_off0000d40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 11372 bytes
SHA-256: 96cc012eabeccce39d50989fc711d05d7da5b737d33c1ff84d8c0fb747ac89a8
font_02_sfnt_off00010649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 17776 bytes
SHA-256: 3a3be223eae6d41ea50affe8a637516cdd30b8e5edf5fbfe8f0268e52730e311

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