Malicious PDF — malware analysis report

Static analysis result for SHA-256 1793a8af520ad07f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 20:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca7494924dea7e75f945cb315f3d8a55 SHA-1: f3e06093458905029f5a3d6a27ec99731778ccc1 SHA-256: 1793a8af520ad07f593c1741ac878bf2217043c7dbecfa66bf209ff1123b2ca1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://mariapolis.net/ckfinder/userfiles/files/93550143755.pdf In PDF document text
    • http://progetec.org/userfiles/files/86521603502.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/15873991671.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/43340853075.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611ecc7bda5eb---57505285033.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085fd556b543---74801312816.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/pojenekija.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/4e1a84c3fb8302ae05c112173a1c01ef/14714823598.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/vapet.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afdc884fcab---vetebivugapezilidabowo.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/79218554340.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/kolobabisaxevu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607731ae5c4ce---19060173091.pdfIn PDF document text
    • http://hkalc.com/userfiles/67006309897.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/50608361454.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/65838330772.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607812dbddbdb---56533909343.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2e0646673---21849739418.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/jiririzivukurotefes.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/duvuwamu.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/moluvopujekumun.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c4c5qphfv4ko33uliku1hmv2n2/29434110684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=probabilistic+graphical+models+in+finance+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_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 11208 bytes
SHA-256: 6678f2f843b0a66bcf43269000cff786d5bbea1de0d99ee8b28d61e0feda5b51
font_02_sfnt_off00010ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC3 18356 bytes
SHA-256: 900037b9a982e7ecba910297790f267cfe1f25b9d2ef1d44de5fa3b0dbbae9b9

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