Malicious PDF — malware analysis report

Static analysis result for SHA-256 802deaa4cd81b5a7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 23:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab91754beaa4cef50025455b5bcc8e0b SHA-1: e2b5af11907346676d4fbfc7a36d6929f78029f7 SHA-256: 802deaa4cd81b5a788f4d077ce1f8bc5fd1368e07ed9e840a72363cbf18d2690
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement with potentially deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://nomylo.ru/uplcv?utm_term=clash+of+clans+hack+download+free PDF link annotation
    • https://fceresources.com/ckfinder/userfiles/files/jinorirobatusoxiju.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/27838896192.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/72605180159.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/vafesetifubesa.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb25d3e00---71788592892.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/50531467340.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/2259067385.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/68157631697.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/24169828650.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0975e410bbbaf9501e293b4b01c7d26/posokufiguxogimaj.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/82ojdcmem35vl389lupg7a7kbh/48361305786.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/kusivinegimanedizi.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/tuwutetex.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/tunetalug.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/fudojusepa.pdfIn PDF document text
    • http://pnalog.ru/images/file/49712028867.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/89910130224.pdfIn PDF document text
    • http://seed-hongkong.com/uploads/file/18698755420.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/vunatesima.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/lorewupiw.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/86467652510.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/85153009095.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/nowosaxilolivaxad.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/39765573384.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109051608069697.pdfIn PDF document text
    • 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_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 10592 bytes
SHA-256: 009f566dc3b441d39671541c7f5f7bee9e963e284c5089ed5ee0dc288564ae86
font_01_sfnt_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBE 17800 bytes
SHA-256: 3d2338038128d0cf8923cebbd3eef19fd23c88f681c28201802cee98abc3be90

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