Malicious PDF — malware analysis report

Static analysis result for SHA-256 44bbafea56a5748e…

MALICIOUS

PDF

77.9 KB Created: 2021-09-13 16:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd266cbccbdf5e2c5eed9f3754e3931b SHA-1: e5dd66e22641ad99c42e4a99420fa1f01eca493c SHA-256: 44bbafea56a5748e4b8306773da2f05a2345597a5be386406aa3e8706adaf2f0
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to unknown PDF files on various domains, some of which appear to be compromised CMS uploads. The document body is unreadable, suggesting it's not intended for direct user interaction but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://shoreluxurylimos.com/userfiles/files/jegifupowefujile.pdf In PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/58931154805.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/93680503433.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/81959612657.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/95265002841.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/31838603.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/30369508434.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/nusivegajibaje.pdfIn PDF document text
    • http://all-premium.com/user_file/files/62110844466.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/xebubazezozexafised.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/banemisabe.pdfIn PDF document text
    • https://termoformat.md/img/files/93895046868.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/58959978967.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/r8leil1d4rhccuqsv0oe2nk76a/10065122618.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/kajosamawox.pdfIn PDF document text
    • http://headrepublic.pl/images/files/43618555933.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/bunarolufebemejafatowit.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/xerijugipizoxum.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138978b43ca4---zesoredesepibivapikamukem.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/6337257338.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/24984529674.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/93414262179.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/kexuwul.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132447753129---vasivalalunenemizow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=intestine+digestive+systemPDF 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_off0000cebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBC 10292 bytes
SHA-256: f6eeb152392ff20fe3c294a7d62b2785e6a3a95e8647405b0d87a18a74999fc7
font_01_sfnt_off0000e5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B1 17156 bytes
SHA-256: e5d2e09e2e97dead6a385863e7551b83ddaa3b125bb1a44cd74c16ebfc5f9828
font_02_sfnt_off00011203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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