Malicious PDF — malware analysis report

Static analysis result for SHA-256 155ca54ec7d35b26…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 22:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 319f1a3f9f52d4832f1ed6183dc10014 SHA-1: 9866421c4866732a5cccbf539e69f875e05a1367 SHA-256: 155ca54ec7d35b2644776ab616d5608e00127b5148121e62df6ec1d637785372
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress upload storage and disposable hosting. The document body is unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://skinrepublic.vn/webroot/img/files/60397198138.pdf In PDF document text
    • http://schokoladenfontaene.de/idata/77798740096.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/vefagi.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/51979025804.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161322d5e41883---18546656571.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/fudevisosazetiwa.pdfIn PDF document text
    • http://smogy.ru/files/files/lubodevufigaterijeluzanu.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/zadol.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/98223538365.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/98839552379.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/ponagufu.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/xozuwifadogaxo.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/8841728053.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc386c4e48---15795705381.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1631127631.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/dceh7dgf5id1j58199bcmgak9q/28421320709.pdfIn PDF document text
    • https://spyboarcams.com/files/kulerizixuxap.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/70658439771.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161335b8f7a2c5---boridetanevuwugi.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/daxopovoporog.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/49809997219.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/63239222290.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/vuturirapebuza.pdfIn PDF document text
    • https://tl-systems.hu/files/files/80539667953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pride+and+prejudice+book+downloadPDF 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_off0000ddc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC0 10792 bytes
SHA-256: 8bf736329fb5ac5cb430e906b4ceafba4d84725f75d5a5d100e42f02a1df65c9
font_01_sfnt_off0000f668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7A 18252 bytes
SHA-256: 1f33acd0a7a786e7934c96103e2daf10e75da5974b6caa9211e84aca9488b5d9

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