Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3945915ee65870c…

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 05:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6d2f19d9847eed7a1c0e2115ca7471e SHA-1: 2df12dc19198ddc90844a66cd917d335a9784c36 SHA-256: c3945915ee65870cdcaeffb6f3df7dd73f7c282dc1da539a6083286ebefd7c7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also contains a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://tranhtreo.com/images/ckeditor/files/45906346601.pdf In PDF document text
    • http://polipack.ru/content/file/wemapa.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/bevopemozepuxad.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/80121810115.pdfIn PDF document text
    • http://rafaelokazakov.com/file/39450109283.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fetosilumoxogemanoz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082798b1f20e---67783884287.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/35744198169.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d8ccdfb9f5eb7de61d6ba4b80229362a/novazirodiruligibuf.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d417e4541---pimesuvujiguv.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/xiloliv.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a727e7f0c11---rogufopokituwugixalomusu.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/5326814547.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/32e2c047c5636f1a3c91d3aca23a414f/46344164552.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/fepupudonekakivikefeb.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/demitogaretomun.pdfIn PDF document text
    • http://parentini.it/userfiles/files/zuviselo.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16083aaeae422f---zonifoxalavolobev.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/18143155599.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/jogagigo.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/85171383345.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/bunimabita.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/478877033.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/91176373914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=jee+physics+paper+2020PDF 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_off0000c4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B2 10452 bytes
SHA-256: 78376aff0b178c4937e470e95d889f8ca0d37fea24f7c8e779c3eb8956e642e1
font_01_sfnt_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 16784 bytes
SHA-256: 10414cc95cf8abea27a68dc547d8fd92e89437f4bdc8073da1bc1604fe0ec5bc

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