Malicious PDF — malware analysis report

Static analysis result for SHA-256 580fee22c35a9d31…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 11:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1264be7296d7e172b2839b6ff12530b5 SHA-1: b71025242ad98debb81b4d1bcd8a3d2374e7877b SHA-256: 580fee22c35a9d31e1ce95b4bbacc979bbf694ae2c2bfafd6a7b27882aac3fb7
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 domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://unseretochter.com/images/file/rolajusomogibegonud.pdf In PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/wulox.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/wunofi.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/lowujusixulejo.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/pefomox.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/33480994046.pdfIn PDF document text
    • http://kunbot.com/upload/files/55414838604.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/50094359229.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/55800090020.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/82791981436.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/lelosebijasilurevela.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130377c0f0b9---poxasosum.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8a84d488---12727163587.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/89904483089.pdfIn PDF document text
    • http://atomleasing.ru/media/File/58607550387.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/sawipimiwadagosus.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/sinaworame.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/tizereridadiduwolawew.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/11441095576.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210913002050.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f6cf4796920206e06795f3a6f5f41122/33200435825.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/76322626268.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140148522eb9---56643161492.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/24095994975.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/10981183521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=memory+zone+android+app+sandiskPDF 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_off0000d366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD366 17620 bytes
SHA-256: 5df4985f8a2fd4d6a321d5fc6aa20e53b4ed391057cb1c60cd991f3461b793f4
font_01_sfnt_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 10668 bytes
SHA-256: 75e97fe359149bca2a4d91fbe862731a4dd3492d98faf68c381a4b6f8eea19d9
font_02_sfnt_off00011965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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