Malicious PDF — malware analysis report

Static analysis result for SHA-256 03105c84fca55100…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 03:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f6a03227b708749ca8f1bb7770cf7f74 SHA-1: 46188bdd82946a46e8e3b29b2c4c839ba9a0a9f8 SHA-256: 03105c84fca551000dcc53c6e9d64a7d09e1bc27b22e60a25dad9742745545f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to compromised upload storage and disposable hosting, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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 https://infiniteprospects.com/FCKeditor/file/83263728638.pdf In PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/vekaderezitudezu.pdfIn PDF document text
    • http://sial.pl/galeria/file/95277371505.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/femirofudupomep.pdfIn PDF document text
    • http://kingnature.ru/files/files/balojisaruwakadavejokiwor.pdfIn PDF document text
    • https://renault-service.com/userfiles/xekowufivazu.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/zuxazakexoj.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/gaf92jrlbtt93301e2mnsr0n5l/80262140378.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/zepadum.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/5c9abab36b50bc32e8fe8f5dd7aa3b18/58436082671.pdfIn PDF document text
    • http://cloverdiamond.com/file/pegorexudasu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3e9a132fb---zanedojes.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607309f11734e---33311907.pdfIn PDF document text
    • https://topupdana.com/contents//files/tubuze.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/37223828082.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/toteraremezanesurupoj.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/binorigusesuxuxemikeparal.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/d49d2aec17e17b2b35b5d286e484abfb/77116397601.pdfIn PDF document text
    • http://mayjack.com/upload/files/rexulegusenuwi.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/84202448786.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/23237644113.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/soper.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/tafabebatilimop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=child+and+adolescent+psychopathology+a+casebook+4th+edition+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_off0000c7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D4 16620 bytes
SHA-256: f58656c527444ac4fd1e79f82fe565ae68c9c0816f57237193b707b6d371254f
font_01_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 11252 bytes
SHA-256: c9998c41300707dbeb65690b206ba34ff4f5fa1e2ef41d2fe6858f862f48089d
font_02_sfnt_off00010d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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