Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16a90b1fc7ff335…

MALICIOUS

PDF

84.0 KB Created: 2021-08-15 08:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cd5a30ecf0cc1abb41af5867e7d5ddf9 SHA-1: f6da97ca1bd394320f21e4fb2e197b377ad1d528 SHA-256: c16a90b1fc7ff3351d15711c3dfc86bfdcba6e07dc6cbca0ba2974c49f01a279
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://oniceh.ru/uplcv?utm_term=are+niagara+falls+hotels+closed PDF link annotation
    • http://areaarchitetti.com/userfiles/files/58646194814.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/92273586233.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/mibozeripowekot.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/63ede3505cb5bee1ff9d0c9d2cbda311/zepabiv.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/31740742311.pdfIn PDF document text
    • https://hiroyoung.com/data/files/93905254763.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947c3288b51---tewam.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/d05ee625f5ab6bd2a8d363fe15b0e0dd/jibel.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c311a818366---tukeguvikor.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1237bc1ad---19116674712.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021042910093873499.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/3it3e8lk5l9ult1b04hk0983oa/dipomulagisuk.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/58449063299.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/mosuvuripi.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/kesesaxelafanojovolera.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c6634187864---bomevedadibikijutakiminu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mudanonowubeliniruvufom.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609119f236529---40792482749.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/71107778232.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/65442678667.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/forezupibaxukidisupam.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/fawupugusobomijalurawoko.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/dekegaleba.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/30e59edf06630a32fead9abf361a7936/37666539987.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/tojitofedabel.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_off0000e2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 17004 bytes
SHA-256: 56cdf3a856d86e9c7cc3f740cc0faa17fda3bb584524f199d7bbb21c40d25ca1
font_02_sfnt_off00012776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12776 10736 bytes
SHA-256: 5a96261ed5ad40aaf351e3ac4fbd7818f207b36e0f0c0552c4cdebd43c9a1fa5

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