Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c7f8abce6e2528…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 00:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ffd833e0e96a194fd8d135809b3ed86 SHA-1: 22d2088d60f71cfe960d97fee54ccbdf86efe9f7 SHA-256: b4c7f8abce6e2528cd606c1cdf560c9d26f87ab021140b2390361f71ff268c4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=best+site+to+watch+bollywood+movies+online+free+with+english+subtitles
    • https://lhdgv.ca/lpch2010/userfiles/file/60650664090.pdf
    • https://stotex.rs/files/tiripaxuzijuseb.pdf
    • http://thedreams.cz/files/duwuvivisevudibotopog.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4231781ae---nukiwizasadasupodew.pdf
    • https://xn--80ag1a2a.xn--p1ai/files/file/dovixokazudedoseludoga.pdf
    • https://nbtele.com/en/cache/fck_files/file/55397097741.pdf
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/gavixerebalifuvovojipigo.pdf
    • http://hyswimpool.com/userfiles/61874502992.pdf
    • http://dulichgiahy.com/upload/file/zogediwoso.pdf
    • https://lanjutpt1.com/contents/files/pegexalozowoturutupalifaz.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16136129519f76---11610124041.pdf
    • http://cokhitienvuong.com/uploads/files/633453004.pdf
    • https://weborder.cloud/userfiles/file///kimesepu.pdf
    • http://goldendazzle.com/upload/quangtri/files/64573193745.pdf
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/57852556372.pdf
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/28984924346.pdf
    • http://autostyle-japan.com/js/upload/files/98212970738.pdf
    • http://elvirajogsi.hu/ckfinder/userfiles/files/zinefigas.pdf
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/3040805338.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161488a8e38765---pebidudena.pdf
    • http://nonstopsushi.com/uploads/files/29651941769.pdf
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/69185592909.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161487d620ef80---tesovatasa.pdf
    • https://serviceelectric.ca/userfiles/file/84793175127.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afbb.bin
de3dd5a16af9f27ade9260215a14ceb57d69c5eed1b5c751c115540ed16eb017
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBB 11480 bytes
font_01_sfnt_off0000ca9d.bin
a47b0f58009cf21cd099425b84e673aaf37baac1dd5da50b48035fdef225d31b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9D 14400 bytes
font_02_sfnt_off0000eea7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 16792 bytes