Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29dc5953ddeca51…

MALICIOUS

PDF

77.5 KB Created: 2021-09-20 04:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fafd9245e0ecb6c5e18070e5fad18879 SHA-1: 4a99eb9874059f37eef5479d5478696e3512d0bc SHA-256: b29dc5953ddeca51b105eda017c155022230682b822a1906a5ae9243cddc0b38
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The numerous external URIs and link farms, many hosted on compromised WordPress sites or disposable domains, strongly suggest a phishing or malware distribution campaign. The ClamAV detection and ML classifier output further confirm its malicious nature, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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 https://drafthe.ru/uplcv?utm_term=android+auto+voice+commands+not+working+2020 PDF link annotation
    • http://thecargonepal.com/userfiles/file/safikotid.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/fozizakatagewerigenomutu.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210917120356.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450021e38a4---sasexibijevopekipe.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/28462066622.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/kemorebusovenadutu.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613526f4c8f42---penabosexewebubusevuri.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161424e3a430b2---mesapetem.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/fotupefofetidawa.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/zogafebol.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/2d0cb038ba1baf2e09f8de4255fce21c/faxaf.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/55852675070.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/98300847074.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/fopapo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8bd35dc56---mewadelobezavup.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/dajoxusudurejetemuv.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613303df6d918---21050317625.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a172e5b699---xemiz.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/muxapamovowe.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210907_230221.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/bukisinajotaputaxexe.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/88672710021.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210902_D772DA8555C85709.pdfIn PDF document text
    • http://mcutech.net/files/lufonizo.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/43574266210.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_off0000c8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EC 17276 bytes
SHA-256: 9976ccd620480532ac530d70a2be64f08def836c05981ecd63b6a7c5e9812f50
font_01_sfnt_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 11232 bytes
SHA-256: 37f7c9f7a3bb8d31ada48c6358f69a3fe6346de9e57aca5f40f24847f4fa15fb
font_02_sfnt_off0001100d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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