Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fe389e4751dffe…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 04:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77f46767a1a6ebbecb24b8004e42063d SHA-1: 96e362b6a9c43e67e31900d4ab0a3a0ac3eb3d6b SHA-256: 73fe389e4751dffe5a00b25fe8088bc0399ea806d6d4f80669a99b58fc8acfb9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://egyptlance.com/userfiles/file/lamaro.pdf In PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c639e819d5---95363694250.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/dizezilete.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/mapu1j5ggj7rr8fu8vh1ne5acs/voter.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/42327743607.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/42738988177.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/jikobiribelu.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/79291919338.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608833da62a56---xotojatisivepazax.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/16586532067.pdfIn PDF document text
    • http://4yoga.by/pics/files/64837427304.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/69178141902.pdfIn PDF document text
    • http://dienmaybaongoc.com/ckfinder/userfiles/files/betuza.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/muwifetowugikegugonapemit.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/15441615974.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/sokopudugurinigogeba.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d61223516b---vodonipewozexixofoza.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/lofenabudamanurited.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/vakasimewofarumawuzoreni.pdfIn PDF document text
    • http://signauction.net/userfiles/file/wefavoko.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad91283802---72760023121.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b10aeb197e---dadusinoxevof.pdfIn PDF document text
    • http://baoveantam.org/upload/files/80236221477.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/77997095349.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/75810795267.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/908ec3c91e4b890d0885477e8bf6ed57/xibejipekejedoxuxasuw.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/80360682792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=progress+record+definition+pdfPDF 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_off0000e368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE368 10588 bytes
SHA-256: 91d8dcda40bd8e8b03932c1d64cd45dd9aa1b325bd15eac8c420ac1890d68a3a
font_01_sfnt_off0000fb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 17764 bytes
SHA-256: 0a298011b174c3ba797d9b6f250a6b6d4a8ef5344bdd0377a7bc71e724c27294
font_02_sfnt_off0001296d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1