Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fb9d8d32f88504…

MALICIOUS

PDF

76.5 KB Created: 2021-09-03 01:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad049b4be209ae6b5bd6f26a044a20ba SHA-1: e6caae1cb2a9337bff1e9f04ac7d9c31411466b7 SHA-256: 77fb9d8d32f8850439f69c24b1694eec83e7e84f173fad00c35bb6a78b9adb9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites or disposable domains, indicating a likely phishing or redirection campaign. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://charivne.info/images/file/namofoxulovepobuzezu.pdf In PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/11094063913.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9de5a88f8f---mabosuxekizutimiloril.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d51995ff4---zefapaxidewutelagug.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05faa238ca---36327600933.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/aa728af555c13871f5386be9a3a9e75c/67363313110.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/28507999778.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/48224088015.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/15642702539.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160783f8fb464f---6538250155.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/42628259416.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/nerafiwetopubedu.pdfIn PDF document text
    • http://fittbike.hu/files/file/lenopezagekesatifiwamaw.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/j4uk1en1i5554c3u2cuulh0qd2/97540829966.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/pibagiwefaxowoxujekug.pdfIn PDF document text
    • http://esejsc.com/upload/files/70982435443.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/1d64fdc0f0838aac609ab65173043e83/jetobovanoretiwijazoz.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f42118ac6ef00dcb5170d9422282e2a8/74776158378.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/25117131885.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f396b8e606---39001204980.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/58163322460.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/1a51aed6c4d762bd9f64681092f2e66d/69131697369.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/136b312b97fbd6a5531a6448587b28b9/81984819292.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/80729130827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=correcting+dangling+modifiers+worksheet+answersPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/tipimok.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_off0000c83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83A 16556 bytes
SHA-256: efb4202a0bfcd777ca9582c8e1c208079635108b3ae244499fb2aeb24794ee6e
font_01_sfnt_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 11132 bytes
SHA-256: 44e708cb6db8d087d453c8f0b33de3a518939a6372506477662e8cd43f6b1c9b
font_02_sfnt_off00010c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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