Malicious PDF — malware analysis report

Static analysis result for SHA-256 419eb84a985933ea…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 01:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2699ea5633cffe8af7f028bee8f70637 SHA-1: 21131696df5e243b29caa22c7ffdab3e8fa79d4a SHA-256: 419eb84a985933ea26010c6414292e9130451fe163dc8980f4cc7f2e0c1e0cee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting domains. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cdkuys.handysociality.com/upload/files/42594069887.pdf In PDF document text
    • https://asesoriagade.com/app/webroot/files/files/jilawusojez.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0bff5fcae094109d04937f6126165faa/38593751109.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/kivedagemarifegavepozafa.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109131932334434.pdfIn PDF document text
    • http://leton.pl/userfiles/file/dozofoperafewivizun.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0425d4d7b8ea869f54dbfcf821dd9cc9/25856668188.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/fekorumonup.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/xizixixafi.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/kikuw.pdfIn PDF document text
    • https://andrejc.si/files/file/xafukelorid.pdfIn PDF document text
    • https://5974293.pasarantogel.com/contents/files/vixaramimog.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/61187922866.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/10162890081.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c7pv9gp056u1qj5stoclkbmvo2/gidojemixojetudidajanobov.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210919052131252.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/zefezofatizodiwepudim.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/tekotimizegabisaleti.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/gibabizibo.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/fulejavuzegigixipiwebo.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614653ee19104---bagadejarad.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/17816897932.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/66027373714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=play+store+app+install+free+downloadPDF 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_off0000d5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 10692 bytes
SHA-256: 032e3ff1bfcc2d446e3e574142d9e5ae7614944552f2098ce8cadd14083ac668
font_01_sfnt_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 16716 bytes
SHA-256: 8455dc4f81690e7f9fd0b4a9a8cef2d483ee9c68e88c49a3599208ea83ece5d8

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