Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aaffdc106e82730…

MALICIOUS

PDF

75.8 KB Created: 2021-09-04 02:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0a5dfd8f68094968435a5b3a26b74af SHA-1: d057a4ee98600a388016d46df6501ac49d5bf74e SHA-256: 1aaffdc106e82730a9a6a7fca38064f7c9212fb7c2413dea8a8155b8528fb82f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or redirect users. The PDF also includes a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/97336560709.pdf In PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/oc5vrvc14sppgqer63qgj3f2u0/63042174447.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072078b1aa77---ginipasegujoluwozat.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/rovegajeluzon.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/zotawaromulidudobanox.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/1625573133.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/56512015663.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/198df2b51f7621d4f8d20efc07acd456/38015831158.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/xexose.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716c305aeca---19304795494.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/85378267906.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16114312221d6c---8101543177.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/8dc37e63345789c58ed5b93ca8b75a06/rurulotoz.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/vamirote.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/20677100388.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/sodojirodalogitunotokifaj.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/31513da4f866166d9126a39df88fdb0d/likemixolopozujir.pdfIn PDF document text
    • http://aurora-c.jp/files/files/67556671155.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/89727211443.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077411d8eb73---gijodesepogoseros.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/f186ejsbaqri9bmb6l12gga9nl/15638525622.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/29226137695.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/lebanitopukulibodol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=larin+engine+hoist+manualPDF 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_off0000c605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC605 10612 bytes
SHA-256: 06a887e8fa51262e2e09003dfd7b311d6d876daeccf6b9cf03806800853a886a
font_01_sfnt_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 16768 bytes
SHA-256: d33e5cbb22ca95aa4510310f6bf2e5e4271268316a1356c4e0b5edfd954d71b6
font_02_sfnt_off00010958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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