Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90cb646164fc9b2…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 02:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8c9faec5e8d02d1b83673194fabce411 SHA-1: ac85044b9cbc3d596597c9e5ba221eb2156ad960 SHA-256: d90cb646164fc9b202347e2dc5237ed7b00aa5b10028e238516697d31f0644e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing operations. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://briljant-maleri.se/UserFiles/files/lagowirumibok.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161210601ddd85---28361240145.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/kuzunox.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/60692174585.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/242d9a7dfec34bb2fad33bc75ba8ae34/vuxeb.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/89236150347.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a3b313045bac17618ce508a6943da98e/66343278327.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16230205838863.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ebfea7724---remapijipakafix.pdfIn PDF document text
    • http://apple888.vn/luutru/files/jizadenejinenilanuma.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210628_132419.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/vefusadexafoxazejasitoka.pdfIn PDF document text
    • http://upakuika.com/img/file/46041182876.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/saguwaveriwumoxane.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/fanoz.pdfIn PDF document text
    • https://arerp.kr/data/file///rawiwenugudiwutipaba.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611c3e17024ed---86141989841.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210903/files/20210903212137.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123b176606ed---napevidifokuzabumojofob.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/16736255299.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/2932178464.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/gitudumanodevipuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=map+scale+practice+worksheet+answersPDF 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_off0000ce34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 18652 bytes
SHA-256: 0981513742a08aa705864c5d514678c81816deed90167bd4e189cebf1e43b6d8
font_02_sfnt_off000116a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A0 10640 bytes
SHA-256: 239b1fc2b8b48748c6ec10ad50b77f63e7877fbe5aa5f6a4b5ba8e8c0e7f69d0

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