Malicious PDF — malware analysis report

Static analysis result for SHA-256 be66f159bdea3838…

MALICIOUS

PDF

75.9 KB Created: 2021-09-19 18:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 93c06ba25a913d677cc200fd4152b9b3 SHA-1: e0ae5a09224e189d8b4284c600b0d7dbd31a1a7a SHA-256: be66f159bdea3838436bc3fd4e21e37c5ce27f882759033d5ac8fa2fd638ee27
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely responsible for executing the malicious payload or facilitating the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://crewmak.ru/uplcv?utm_term=carx+drift+racing+2+download+android PDF link annotation
    • https://bellcera.60km.com/upload/files/xufosaxurewav.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/zapekomonogibenuve.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/farujogojovimidosevara.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b180a74e17---sajilazapajovozokomunix.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/59871526075.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16138e241124b0---wotafub.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464acf573ab---63229532105.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/2140108625.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfe534eb80---jofusisomugomojugefu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021981227457191.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/46929618975.pdfIn PDF document text
    • http://learningkey.org/userfiles/65495469739.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/jatezagemuduxiwajemuvufu.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/mexusotuv.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/61108514475.pdfIn PDF document text
    • http://sireny.net/share/files/89874649205.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/rosulifenimavebe.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/43982953798.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/wutibanikap.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/kinutagonekuxotegiwotam.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/87840567626.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/50602763022.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/75736148155.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/wijozibekijuronotet.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/jatux.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/7db26fa2cf0d36a9e7768b3d9f0d43f7/6022606022.pdfIn PDF document text
    • 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_off0000c78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78F 16040 bytes
SHA-256: 085c203c277437792fd5b9d21d4b411749ae34e5ab64399052cca10d230bf0b0
font_01_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C1 10688 bytes
SHA-256: 8e009fcc68b3c4183e38eeb38cd48dd77e8b7131862905944b941dfe57034261

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