Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a7173fbd58ef4e…

MALICIOUS

PDF

89.2 KB Created: 2021-07-20 19:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 42c083566ce500f2817cec864ead7ff3 SHA-1: 57a55e2a52a04c315033af148f9e5d871985d9f2 SHA-256: f8a7173fbd58ef4e136cd3230d1b4af30e8441379eb7dcd0e788df431fe692d0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document body is heavily obfuscated and unreadable, suggesting it's designed to obscure its malicious intent rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/bigogawik.pdf In PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c346b862fb---32328685758.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607440154b5ca---zibebuzameserabegajufa.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/getawipukefaxerosefaba.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210514130709794.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb7b80f907---vipafadebakupegukuzub.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160795014ec6e4---torofevimimulor.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/60131884411.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083519bb4e89---53543750044.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/xokojotubut.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6473ba387f---tomidamomowebokogod.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/cf438a50aa1a856a97d3197f288fa1db/bimajomovuzejodovebuse.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/14686811667.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/76098470239.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/pibirolelagexutu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3a6a62524---40223517270.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/lenetulara.pdfIn PDF document text
    • https://datajournonepal.org/files/ruveriragezunelinad.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ed1ae5df6678cfccd9a7fc2d980139e9/ziduravulaxenip.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/dmtj9tekm57898qdmjlt0c0hf1/15048100208.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/83016426079.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e326c645056167e0867fb0561f7f0c82/sanofesufofol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=psalm+for+hope+and+healingPDF 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_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDC 17348 bytes
SHA-256: 6371f0450c17018abbb62334144d5fea63692cff57bd5eed71f001b8133b071b
font_02_sfnt_off00013d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D91 10848 bytes
SHA-256: 313f7f2dd14bc4ab056e0a4b0cd7c5fcb511a042dd58c4d653f7c5cd7a798d08

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