Malicious PDF — malware analysis report

Static analysis result for SHA-256 050be1b3d09a6705…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 07:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d766a64c100bdc6362f2f77f753d2a20 SHA-1: 16ae2e66e1edb2047470da487a96e8a0b0576de1 SHA-256: 050be1b3d09a67052275f46e43d54a0d3b9bcea2992ce2ad803ef979fc1e1838
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of external URLs suggest a link farm designed to obscure the true destination, likely a phishing or malware distribution site. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=mcquail%27s+four+theories+of+mass+communication PDF link annotation
    • http://kencert.vn/uploads/image/files/63259852482.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607526dbb38e5---97138095449.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/15408771967.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/amq2g8js6aleqri3bd588q5ffc/17307738239.pdfIn PDF document text
    • https://cubic.is/userfiles/file/lufuxonorumozo.pdfIn PDF document text
    • http://prmakeup.com/Image/files/24538237488.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/44814692691.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/borewipuzikinumobe.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c74ff82445f---tokiwenedonawelowawojet.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/6287981241.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d02d78fcb---82520139429.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/60999462404.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/83537961321.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/bodovuviwafanujelinifam.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/56165655488.pdfIn PDF document text
    • https://mahae.hu/files/files/zurosejorerafugipixitigog.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/drun14kc80feiiule9nifi21jp/35448394943.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/ec51d7050b3e75a70b04d515f9e9a9be/71464245661.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/bosavo.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce00333869---xivaremaz.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/pemawiru.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/9000358836.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/rnteuq268m8969h3gpjm4t5cbh/48788653719.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876d57a4ecc---24024226696.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/vetopadonatubokedigi.pdfIn PDF document text
    • 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_off0000d2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EC 10872 bytes
SHA-256: 74ed540a4db2fcde048a07aa104dc3ad49ca50a7265d3ecdd8037e71b7f87ea2
font_01_sfnt_off0000ebf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 17784 bytes
SHA-256: 5a926ab89414d05bd154da86fd266c6cfc3d72620f64d2480ea338a79591f601

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