Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d648e91912ee30…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 10:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ecfabea6fdf80af2170ec1de0e4c08a2 SHA-1: 64405b3530bf60d23f058e1d4e371080dbcd7d01 SHA-256: 48d648e91912ee305a45ae1a74fb7adc28a3f910a84620b2640c1231c52f04a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The document also features a large number of external URLs, many of which point to compromised CMS upload directories or are part of a link farm, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=state+of+survival+mod+apk+download PDF link annotation
    • https://havilahbuilders.com/userfiles/file/kiwijavufakonameden.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/bodinefule.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/mexitekuxu.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/zufirowitajapumaz.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/tibinididiwokopad.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/sagurafir.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/kurixedax.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/kasuxut.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/30965579124.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/89927520855.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/dizix.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/17b551ebac46ee20d3d8cca19338b475/safozizinexapiwarudovigum.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/79010681532.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/korizuwenisewugel.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/52506199564.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/26126363963.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/23813531627.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4340a3b7025e415cbbfe5ed64c1fda84/80210804035.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1cce72949febb303720e763743d4fa44/78726263863.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/fusasavu.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/zajogikedamenewumemizokip.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/zidosovunopafejanagudav.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/52579574309.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/dofiwosekenozewa.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161368205e8ccc---rapozubedonodatebovozumup.pdfIn PDF document text
    • 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_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 11080 bytes
SHA-256: 06a1692d7d623a4bbbddc4552fe9280cd44b5476d5ea8b29cc802421051925e6
font_01_sfnt_off0000f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95B 17420 bytes
SHA-256: 21fdb0268d92ce135d83901ceeb9c4a0cbaa599d868b9312577264092b01eca5
font_02_sfnt_off00012674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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