Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e0226399c4a90b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 01:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa6a2ecf6ce122351da95c02cf1d585a SHA-1: a9cb0a768fa715f91032aecce468d434dabd3d28 SHA-256: 36e0226399c4a90b009fa0dfd7f36769a0a36c79fb7429a2cfefc6a283b539ee
176 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. The file contains numerous embedded URLs, many of which point to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms and the nature of the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://ostrichtours.com/ckfinder/userfiles/files/tusalepoworo.pdf In PDF document text
    • https://tennis-samara.ru/img/file/nipofimipise.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/24879203305.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/zibazazakakezidozet.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/noririwu.pdfIn PDF document text
    • http://deauville.ru/files/file/55231972290.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ed07d9b41---lunidotegobibiwitulob.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/16283677382.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/jibudulodinepoxixitizazav.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/91190959999.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5a90fb44---34076946730.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/xosodulexuzoj.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/nuwofoxogukepuf.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/nasatel.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/xometizafalekobebosediviv.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/16079401675.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/duvapumesinumavitoxe.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/89094329627.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/pilofukexuxiwosofetoza.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6567b98b6---95558379181.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/musofadawo.pdfIn PDF document text
    • https://tckontrola.hr/files/nuvosonewa.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/44676745122.pdfPDF link annotation
    • https://goldgreiner.de/userfiles/file/nejisepibodugiminuwewisuj.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/78517472935.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/42675959931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=wifi+password+decryptor+for+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12B 10760 bytes
SHA-256: 3649c1fd2539850285dcddc1b6fb1437610888fb7ff95e126d6dca888e6d02c4
font_01_sfnt_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 17748 bytes
SHA-256: cfe82ea12ef27cb5eef6197eef57dd05136b0e83cadd7680b9a754083159884d
font_02_sfnt_off000117c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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