Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5498db05cded91b…

MALICIOUS

PDF

85.8 KB Created: 2021-09-24 07:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3fff4d6361866fab3f7a2d5f296939c SHA-1: f06a87cb67d57a948e3ed28c4cf38303469b4a26 SHA-256: b5498db05cded91be26988a25c7dc2a5c1f51be9e7c8f1339631e4a51b1d283e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laatuwhuisweerstralen.nl/upload/file/xikijowetorinukaxutogim.pdf In PDF document text
    • http://architettoangeli.it/userfiles/files/xobatusajugud.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/tetamumuduxu.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/gojekedeguxigozojeku.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/96441416518.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/9340546622.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/luxizikezasumomonojopixe.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210904/file/xojebaxatilamibevukemimoz.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/d636ceb452e31e3168aedf043bb8671c/dubomatisapedilejiwabas.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/20752540057.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/lemeguli.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///68308885935.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141278537533---sejetizokekepojotakobot.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144271fbdfc9---57342202901.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/r0up0bra9tq8h2n27c650c19ao/82634755460.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/74476803193.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/tojoxoxedibolo.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/bejuw.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/20189530278.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/24519344470.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/gafokuxite.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/40520334099.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/wilekokipesoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=best+picture+editor+apps+for+androidPDF 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_off0000e94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 10720 bytes
SHA-256: 053d02b52df2407b9206e106f8593f5467c0c27a8881f85576dfe788e51f38c2
font_01_sfnt_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 18056 bytes
SHA-256: c4ac7b73b83450349d9c07e3399ab71ee2f7a8ec566c9c40388f44d7718bb94c
font_02_sfnt_off000130ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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