Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea94819ca46ca6f6…

MALICIOUS

PDF

71.8 KB Created: 2021-07-29 09:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 835b7085c2f6dc9ab8c494bf7426219d SHA-1: 23366aacf187edf1fe85b4e4c7cb229aea628dcf SHA-256: ea94819ca46ca6f65d1a546e362aa67a3a3dbeef6f2a9dcdb4cabae7e97a8762
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to distribute further malicious content or phish users. The PDF structure itself contains embedded URLs and is generated by wkhtmltopdf, suggesting it's a crafted document for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://trendybiz.in/usersfiles/file/zurobazasolunawuxorotenap.pdf In PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f488e686d2---pejivoxalakufezov.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815f25c2217---99274360274.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1478e5dd---sedawizigexanomu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607421839481b---xanowododidolofurixipad.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/zejifidiliserofowodevogid.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/524hh51l32hvr1h7fideuecho7/dixutitizazazosukuja.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/2ca915dedfa9eb5dd370ffda62d2627a/mizat.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/30370783937.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073a881a3884---ribupoxo.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/zuxogukunigulozugunivazam.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/92169725152.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/42236643054.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/4mgcinvf3pimio9ek3is5kkpk4/teluwotare.pdfIn PDF document text
    • https://steammining.com/userfiles/file/27373040226.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/90802793456.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xumewaxog.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/g9o5nroui8t4fh9dhq51jpu85r/573982749.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/wekumexulidumebopuvo.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/3c4baa991fe68fce037874708e6e5863/90251140450.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f4361d9a4---kefamesovuturoxusilizal.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/muvopopelurulunegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=signal+processing+first+solutions+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_off0000b90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90F 10972 bytes
SHA-256: d42a619cd0d13f8332fe0016ac87544a393e17daa63f3ebcae8991484ec1f3b9
font_01_sfnt_off0000d262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD262 15264 bytes
SHA-256: 121af7d58f6ff465ad0ae4c55c892f9978668dfd8ed3870228a1b15de82b1852
font_02_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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