Malicious PDF — malware analysis report

Static analysis result for SHA-256 1349aea2d6760c61…

MALICIOUS

PDF

91.8 KB Created: 2021-07-07 02:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 92e9a090ace96c9a6da1caaf2b3c9d40 SHA-1: ade7961c0f94b1caacd32b1dac0521e1068a97b3 SHA-256: 1349aea2d6760c61ec2ee31eb1c851c6190887126d6edc557ddb4fe91e100e4b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage, suggesting a link farm designed to lure users to malicious content. The presence of multiple distinct hosts and a 'utm_term' parameter in one URL further supports the phishing lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081efd002283---gavobebupejot.pdf In PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40817ddf3---wezos.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a092d3c1e72---dedemexo.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/fidapopatamejipaj.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/33lvrq7mo1eh50fv567ukola80/74844625399.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d3f9cf9f---64061457109.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/kuriniti.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/906140811.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/99817bfbf48203395771223a104c3e2e/50337378432.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/6821590319.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/vudefokozopetixepo.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5a787511a90a5fffa2d32bb3c5b457ab/vinigeze.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160add64a5bafb---kofapunigijonazikewuvel.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9e6af82b0848a26ec00ca468e08a4356/tudewovipefoka.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7c2a8e560---99038050638.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/walaxodekosesebedu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f816c4f6db---37667496887.pdfIn PDF document text
    • http://chapelguild.com/images/usr/5321964863.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/xilesokirowipupidelugema.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608988b55a36b---nofevemibomu.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/69497369553.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074477ac83ce---mufabimefazodixejose.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2765d1245---fubepaloj.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a9fe1f91f---bijibejekumujowudaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+android+emulator+for+windows+xp+32+bitPDF 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_off0000fc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 11380 bytes
SHA-256: e2c5d1823140a0bc19be0f8aedf9e2bf7150f390e512b4a594020ec76846d9f9
font_01_sfnt_off0001174d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 18604 bytes
SHA-256: 356b4946bafb4e8b608379315db7a7b883656d04f51ecfe5636fa2bc3b8e37dc
font_02_sfnt_off000147b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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