Malicious PDF — malware analysis report

Static analysis result for SHA-256 220d8781f8102390…

MALICIOUS

PDF

79.6 KB Created: 2021-08-11 20:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72fd9aeff08aa292834ac4e936bfac3b SHA-1: 62d98481e1785e4611d54140f5ce7f7cbb3f2dbe SHA-256: 220d8781f810239099302873b2c33ada75d80cf12fd856e2075d50054cc3928b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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://immodraft.de/images/architekten_agentur_images_/file/wopeja.pdf In PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/c82cf63d66b3b3eec93bd1a70e1776f3/13371491306.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2719d673---88242490551.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/vuzuwedijulazivezodaxiwa.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/83941947000.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/24617300345.pdfIn PDF document text
    • http://fitviewer.biz/files/file/zezuvojeko.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/85108719669.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/getigolaludu.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/64276853678.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/gadufaxo.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/timupulejuduk.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/10565948823.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd99fbe4513---gamewezawinaf.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/780875249.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/64680079065.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9b2a36bce---63424036525.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/42021980622.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qrdp242vviq9ct6b2d7nlc1eo2/dinem.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/hblue8niaonv7nbscguk0hgoo5/jexubux.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eda9e07d17---fajevewuzuketisolilinu.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/netabamokel.pdfIn PDF document text
    • http://skyzoan.com/cake/beta/userfiles/file/dufebamurame.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/luparixopijuzinipuwedez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=destiny+witch+cartomancyPDF 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_off0000d6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B2 10652 bytes
SHA-256: a48a0c3a79bd62ade5a361b62ca30fa8801804279eb1089e8e57e9ddbc350871
font_01_sfnt_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 16196 bytes
SHA-256: 7baa0123ccc42e27e83a85837f29a68fed0376b8f3b25d0abb7bd9ce79a3f702

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