Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84b0a0e4b889a7e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 10:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7d45b8c8f9a511efa9dcbffa703c623 SHA-1: 87fb8bfe521e3cdf45c04e40f613a45b2f615b39 SHA-256: f84b0a0e4b889a7e6e741b6c43fea528862799a6b0898afaa33e1e1491da25d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://mariondhuique-mayer.com/data/file/rilovibutokirufediwutijos.pdf In PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/varubuxudodutiv.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/53885415690.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/66070698515.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd65d375f8---fufapad.pdfIn PDF document text
    • http://slsnn.ru/content/file/bujonifit.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1632088990.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/61165019810.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e10dd08cf---41749485647.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/23981047879.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/kuxisewowajef.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/pawujavijo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ee01590f85fdb0f346718a76137f3633/79888597987.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a76777ec9---pozixaxanevovaragudunaxit.pdfIn PDF document text
    • https://beaszemin.com/files/votapujulike.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/refuxu.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/jenebosodurubaw.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427f594ca4b---15979891971.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/pupemafovizafisubisulu.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/18434379251.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/riditusezogebig.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/13859136777.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/57876251929.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/bimajozulakoguzonuvogefer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=soitto%C3%A4%C3%A4ni%C3%A4+android+puhelimeenPDF 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_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 10920 bytes
SHA-256: 655ad11b9836b6d2d7c1445eb8cf536762a4ebe095313841276a17f532265f5a
font_01_sfnt_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 16956 bytes
SHA-256: ce104371b43a7d00b44b6fc46b672d7ca1f13ae2332e46a3597c698d39693b40
font_02_sfnt_off000118a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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