Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4ecf5b70fd0658…

MALICIOUS

PDF

87.7 KB Created: 2021-09-01 12:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 18ed9b77ef0182e7037afa95257f2ae5 SHA-1: 04cc51c7760630a00ed2cd29662fe6ce36710664 SHA-256: 0f4ecf5b70fd065886bc1ba947d9c93a6fdb1875fdd333c2a8de24d70195997a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://honda-vo.com/upload/file/xemirudibadizazepufenolu.pdf In PDF document text
    • http://naturallabs.de/userfiles/file/riretupaxusazetojujixurab.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/62310473797.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/kowitafiduxarebugabonidav.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/55761511592.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/qvo1oudbcuq73ba9jnvp3kvlku/9337446274.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/4b5d07aa15fb2a47f5063b33678a4e01/63127057431.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/42ee46b46b2e8789727a60351500dcc9/wexedotofav.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/cf8d942688fb2b59b84ff094c29740a9/96693852935.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108131953492995.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vh0o52eej0kj95q7g85l2ablj4/vatinegu.pdfIn PDF document text
    • http://bronia.org/userfiles/file/sivujegup.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/74106374162.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/61199039553.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12b61fed2---57554383572.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051414235973499.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/5039mf41u4vjknrurabf49s556/jogef.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/fuc2umj4tp8both6rikdb6moei/49217257508.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c067515e9ed---tenuwurogevisaz.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/46905316643.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160989172c6d32---31416112788.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/kotavefiwakafonoxefa.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/vilujalekibipewigatulejo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161101601b1bc1---dasup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=english+to+metric+conversion+tablePDF 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_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001083e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 18040 bytes
SHA-256: fb5ae7abf0754bb045d0cd3421456ddaf711df9341aea8b35b55627d82bc5076
font_02_sfnt_off0001374b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374B 10868 bytes
SHA-256: 750025c2b35dd7ab98e8834df6daecd72334ef957357229de46254ef098dd40f

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