Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0de42507b53b46…

MALICIOUS

PDF

94.0 KB Created: 2021-09-15 21:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9b6880907acf5a55bca25e25e3e935c SHA-1: b107f1d8a5adc756de66dca4479518a14f43ee68 SHA-256: ef0de42507b53b46ce9811746c789e471e56306ecfca03214692b0be45a0c320
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites. The embedded JavaScript likely facilitates the redirection or download of a secondary payload, while the link farm serves to obscure the ultimate destination and potentially spread the malicious content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://thsport.dk/userfiles/file/wasomoverewusot.pdf In PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/84208092701.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/taxosibaz.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396e8398cd2---lojuranapuputabi.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/35898855840.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/44204774079.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/36887179510.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/biwidurojuvovanojadawotis.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/7b245e6c7006e65610c02a61b5b86eca/lumaribezafetal.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/16272333451.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/lunopidalipos.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161386a621a837---19670795378.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/4684653713.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/39410052020.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///variz.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/22324465254.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/ratifimomekekoxafobo.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/90911766625.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/tomokofemeleberamufexi.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/63112598568.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/kavivusutoxavoditapofet.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/tedivafofotanovegul.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/13881052787.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/77120143519.pdfIn PDF document text
    • http://usmleworkout.com/files/file/65838165594.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/70748550862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=xperia+z5+compact+custom+romPDF 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_off00010549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 10688 bytes
SHA-256: 07c538e641d95c5e876d86dcf36c6d231cd6dfb2c310d97a01a620a46e7477d1
font_02_sfnt_off0001360b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360B 19884 bytes
SHA-256: fe7f4450c87b6743ef5fa9444081e1bcda6f00476308f76f7c1d79d1f87931de

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