Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5bc8510335c556…

MALICIOUS

PDF

68.6 KB Created: 2021-09-15 10:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b81f8a7e23e55e12aebba57e970d0b1d SHA-1: 340078bccf34ab8153ab9420f6383aad4fad6b2f SHA-256: dd5bc8510335c556e95c40b50ce8c478dc7dde2076b0adec5e5bae198d8121f2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common screenshot lure technique, indicated by its small size and image-heavy nature, designed to trick users into clicking embedded links. Multiple heuristics confirm this is a link farm pointing to potentially compromised or disposable hosting, suggesting the primary goal is to redirect users to malicious sites for phishing or malware distribution. The ClamAV detection and ML classifier strongly support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://portalbime.com/UploadedFiles/New/file/rosofeluxexoralipe.pdf In PDF document text
    • https://bulendengin.com/upload/ckfinder/files/robapigagafamo.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/2924253f67b8b82d1a17fd79b8f99c12/zegidowexufajutijipo.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/65701081512.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/88915510319.pdfIn PDF document text
    • http://blgjad.com/upload/files/46420093358.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/molerexodexatatubalaja.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sulexupasatusifedosima.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/xibixolimezomagibepoforop.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/bosonitifefipewoxoxud.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/1831710856.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/zefigefuvolaliguzakiv.pdfIn PDF document text
    • https://dintek.eu/uploads/file/walavojon.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/k3c7dapaltjpc5gmudj7s66iqc/2092131961.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/55772760440.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/56725841425.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/nuvopo.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/69912487809.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161410e5a3a3ae---94371670357.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/485bd52ffaee8be2f6b5aad0394e362f/walezog.pdfIn PDF document text
    • http://101balkon.ru/upload/files/mekarib.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/52550616186.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/karuvaneligebevelurovux.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/63915388571.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/78066536033.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/68931626873.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/gemuwujuwen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mi+home+app+for+firestickPDF 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_off0000b1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AB 10680 bytes
SHA-256: d1cebf522405f07db83e4f483ed7bcdb7df6444bffc74afba11752f109d9dc79
font_01_sfnt_off0000ca34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA34 14076 bytes
SHA-256: bad372def1363fc605e60e984da363896e3a0005fa030887aff49f388ba206a1
font_02_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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