Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a3ec0af1011314…

MALICIOUS

PDF

91.0 KB Created: 2021-07-21 05:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 802ca0d1c59d39d20994a2c2b65e4117 SHA-1: 79b256de5190208f667a0bc2905f5537b2291c26 SHA-256: d5a3ec0af101131494d15195eafa8dc54535722de70195595c4b089fcae68831
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://burningspearmarketplace.com/js/ckfinder/userfiles/files/femapula.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/be667a9a5dc17f9745d054d99cc1aacd/44557726114.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc2779a96---1438428436.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/tvde3hrfrekef3nsik8komoec1/wekel.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b2a192960fc10bc6fa9945813935bf44/kusuvores.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/n2nur6ffm91ld477sqrs39dr5v/wamakawanuzajukexane.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/wewojofiwegitubebele.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/6faaaf62f0d7779f2f118b5be879c7a4/bunosojujogujepovumamowe.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a45ef1bd7---11420068776.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/4012540199.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/dc7aa21c274cebcb9135c7e39c420da7/63328741993.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/visolalirupaw.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/soraz.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098f2cb57918---47407498855.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/qrtmomn7ut2181etgauvbosqoj/ximomuranep.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/89804181546.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/bobedumovezemokurep.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e943df90e816b2a976cf53ce47c254bb/rakupuzanopuguduwamew.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/79458215665.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/29626245951.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/foxekamogoluditigixi.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/ravitizabal.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72745780fd---35831818261.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/jikukit.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/31565175271.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ltjfugss8al3b2b1un3pg4ifq2/rutiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mobile+cloud+computing+research+papers+pdfPDF 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_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 17116 bytes
SHA-256: c58a521ee28623a2007c47e8b8093d576607ed87d0ac13a22f033e35f2244e56
font_01_sfnt_off00012c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C62 11300 bytes
SHA-256: 9d7cf700df5608e7eaf9981cff6b6a89a05d60c624064542d000a185792c94f0
font_02_sfnt_off00014647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1