Malicious PDF — malware analysis report

Static analysis result for SHA-256 100ea5d65a303570…

MALICIOUS

PDF

88.2 KB Created: 2021-08-09 02:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2efd989db95af24965dc9350ab29712f SHA-1: 7d4c8384ece5d99a2f4f924353b9464e6ec500eb SHA-256: 100ea5d65a3035701c7ecdd22cf2cc3071879f0182796601bdb3a28033bf3d63
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to initiate malicious actions. The heuristics indicate that the PDF acts as a link farm, directing users to various compromised websites, likely to host malicious payloads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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://dachastyle.com/userfiles/file/13632580584.pdf In PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f7c1c4e0f---zegoruvidikav.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/veduper.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/38522010801.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f92080f602bf0f39a840bbcaad56338a/64846937436.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/benigumedorap.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/gapuwaxazaje.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/84088661092.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/kepuwokefagogovudu.pdfIn PDF document text
    • http://kfbi.ru/content/file/ximibetozuvaba.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/mofolezad.pdfIn PDF document text
    • https://assistenza-termica.it/file/23180075001.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/bodegezuv.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/21cb4bd78082668929d768620eb7d1d5/52335130268.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/bowotubimatefidi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/63ik9lso394oknrc5vsp4vnpp7/27753642448.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab5375f227---bexewov.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/a79076a592d4b5d1c8138821b31ef6fa/75956489948.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/72925937956.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608389ad70d81---luweboxok.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ba44679537b866555ef83f8cf8d70696/16423559180.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/buworifilu.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b182f86d5c745b2bbe6e019d12d359bb/peburokekibasobubib.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160da9d9f764cc---xutotebumajafupulakojotuw.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e33c7a5d2---11192555762.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/5678e8dd79662c81029c5b355d7f8443/22638449276.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18048149f---faworifenovuxufarekerod.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/0po43v7opsgnnb7r27pcad7vg2/xavevajasixajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=jdk+1.7+0+80+download+for+windows+10+64+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_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 17588 bytes
SHA-256: 95fe02baada14fee92056f8405aad472272aff814685a30b8d11899627575060
font_01_sfnt_off00011f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F83 11268 bytes
SHA-256: 3bf7809950e41eb488102a2ee8356866cee3ab28cecda719d29f3e1c5cd0a57c
font_02_sfnt_off00013a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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