Malicious PDF — malware analysis report

Static analysis result for SHA-256 504880b6c561db94…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 13:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9792b2be5d757dab5c8b3d6607db19da SHA-1: c1a7ff7f5ef11d4985a1940246ac5a4960a6b7c6 SHA-256: 504880b6c561db94aaa25b70a075d3d151d720ea21a43e9010b509601467bc02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and URL analysis point to a phishing or malware distribution scheme.

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 https://tavio.ru/files/file/nuzosil.pdf In PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4e14e6b20ca1e5f0a2d3813aaad3fc87/5371671376.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/vamopinunavimozetut.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/73c4ed59355408c5d3fcfc6d0859a2e5/kasivor.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160983294536a0---71604059408.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/jibiduriveramutalesar.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//pegel.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/kibinusibakafuma.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/waxamomimoduwurug.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52ace9e35098dd62f88ec6ee4f7d7166/gafekuli.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/46939486084.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/43673467956.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/xumazewoneberasunukexix.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1b6560cbabf2f95cb3b671659d54de8d/95449767350.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/vituzezifawovosutixav.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b568a9ae227---xupegumawaparukiwonipakim.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210817121016.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/93101127200.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609b958268cdb---6577740637.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/57337049089.pdfIn PDF document text
    • http://servmed.net/userfiles/file/33635854047.pdfIn PDF document text
    • https://vestol.bg/files/file/39694942770.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0adf1402af---56852501329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=planet+hollywood+orlando+menu+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_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 18572 bytes
SHA-256: fac9bfbb648c89c7a8ec388292319a18af9e42b8b916efc7dd0adadd5386916d
font_01_sfnt_off0001159c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB3 10804 bytes
SHA-256: 4ef5ac64f13af486c1be4517e82c6a6933223584f9f3d34e3fa868217f4581ec

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