Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d837f4ebe5dee3…

MALICIOUS

PDF

76.3 KB Created: 2021-09-28 05:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b3018ed3d4f8a5749ef0bdade1178594 SHA-1: 35aea22a78dacd28de40c283af5ee408e2aa5293 SHA-256: 62d837f4ebe5dee36d2d9271af29f0a907fcb8024fcad06aaefb5eff10c1c556
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://eventechsite.com/files/files/83862577026.pdf In PDF document text
    • https://bilegt.mn/userfiles/files/xevug.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/doxexitigikutivizojaka.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/10804613777.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/79378798129.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/85083840316.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613396001b94d---jutupadilevex.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210927174449.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/xopabifadamanobivatuxovum.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161418de0d5fac---61459262013.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/79356366763.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/sajik.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/87284315179.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/89425316317.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/nugadasasud.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/bufikusuxumunabed.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/sozewebuvelegofejud.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c404d0e911---72885376701.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/67720513844.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/xejeluzenugazadidiwiwib.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9dd5f0164ccc06b65fb4615299258c45/54667158567.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/98658341150.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/zalosurajasolumepemafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tvdream+player+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB173 17644 bytes
SHA-256: 395cb35dc3a6fa1d2da50296b97f296f0ba805271c64a6c559d49848139ca889
font_01_sfnt_off0000ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 10428 bytes
SHA-256: 377520732c29ceb28a6590207a38c581a0aac86cf38a309b5799cc330cd309ec
font_03_sfnt_off00010d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 16212 bytes
SHA-256: a9118973ba4ae0e73ec3f8328811d379f583c76726d6067246b210d54535cb43

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