Malicious PDF — malware analysis report

Static analysis result for SHA-256 237af36b19af0e5d…

MALICIOUS

PDF

97.3 KB Created: 2021-09-08 08:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b0eb9cd9c21e726cac8573d0bd05b5b SHA-1: f3be55cae3cb1a03afcaadb05783db162063177f SHA-256: 237af36b19af0e5d6826ebaefbd8722695cac6ecc55adc18c3551b2cf9f29c9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating a deliberate effort to conceal its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b414fa6070b8fa819582106ea2843b89/kiwomiwunim.pdf In PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec515547922---likewuj.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/40876716054.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/34148eeb4a427edf783aaf7019c48d40/49513001409.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/35164048291.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/89858845365.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af97b7aac27---wosizobuledatajometu.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/wagimenira.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/49714871229.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tebafuneluvaribefepud.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608260b54ba9e---60991051616.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/43500302840.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e42bb2a70120ad4ee104e235c7e0ae81/javovinizu.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/puwofoded.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/upibiivtoeuc75tqtrou903j7v/30645251921.pdfIn PDF document text
    • http://gptools.net/userfiles/file/nufuwajugosasekavamuzoxi.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/mokowazefiwolivuzosu.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/mgr8vfbpstqrimdkh7m51ldvba/27368186361.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983962b8130---67439043551.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/biwasozavakenozovevena.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/81747737354.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/podosasusuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=wassce+time+table+pdfPDF 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_off00011475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11475 10588 bytes
SHA-256: b40dbecee24c9703178353b2e1a6e4139300011aec827bacb11cd2e659ebcdc4
font_01_sfnt_off00012c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14484 19544 bytes
SHA-256: 0d559cb160944dc4656f5f5039d7499e3096278872dd8b84fe0aeb8b5abef19c

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