Malicious PDF — malware analysis report

Static analysis result for SHA-256 3216cbfa99fb2da5…

MALICIOUS

PDF

71.4 KB Created: 2021-09-12 03:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6818b765a2d69d0f1b9669abea36c6ac SHA-1: 7bd05223e603696a6813aec8bbe11094cff004d6 SHA-256: 3216cbfa99fb2da50217ce8bbd1f79714c4b4d739fff152a9247ca697798eedd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/29125158459.pdf In PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/kexat.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613737767a495---86547576236.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/guputirepunage.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/31f0cd3157dc4b99a2363c3016696f7e/92248664527.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/tipijonadoxoli.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161363d02e1776---ruxowarolebe.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/75887521983.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/kafazibuzipijo.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/10899336464.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/leguzes.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/gedesedesumeputimofu.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/kobagedowolixej.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/povusurexamog.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210905173653.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/vamowazekopejupofobu.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/gipasabo.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/95243007768.pdfIn PDF document text
    • http://trivio.it/userfiles/files/gamovorarovijunuvon.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/patovajonujebe.pdfIn PDF document text
    • https://mmtours.si/uploads/dorixizozodoveliliko.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/71807418700.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/tilekemafogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=rom+pokemon+3ds+downloadPDF 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_off0000b80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80F 10656 bytes
SHA-256: a038001012fb1001b7ab9278548afa01b1111887c338f53abe1d4a38770511a5
font_01_sfnt_off0000d08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08C 15404 bytes
SHA-256: 5e951ab916e6bb300baa0094ffb3cbb1a682bcba472a7bd23300f3687334ec8f
font_02_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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