Malicious PDF — malware analysis report

Static analysis result for SHA-256 8793049f94752ff3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 12:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0881c1915841f113703d52bf3346c12a SHA-1: 6b74bac5e9945727a6c477e9bfd18afce069bba8 SHA-256: 8793049f94752ff3ef2bd547bdb0bc8150a9df655e85206e2e0a998046e58cb6
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript and multiple external URIs, including links to compromised WordPress upload storage and a link farm on disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of JavaScript and the nature of the links suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 9

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lindendirect.com/ckfinder/userfiles/files/nogoxujawulobapi.pdf In PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/67120246429.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/pafeviw.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/71876912851.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/88249159792.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/kozuluxubegojipafikawe.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/96035670793.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/rujuxagipopogevudu.pdfIn PDF document text
    • https://icbacademy.com/upload/files/kovedavimakonegibez.pdfIn PDF document text
    • https://digireg.nu/upload/88930438863.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a19b97858a332769b9e10d0bb1f9741f/gopej.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/96576076632.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/10729687661.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/nolubukafumav.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/83971784454.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/fizobawu.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/kigulewuwuvuxiwizamogela.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131140bac9f8---zuwapafivifumujatujegotux.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/67005955519.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134935a1bb67---27737251303.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/wolaraderodo.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/rarapejogowebagapure.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/tamokimijuxexavasumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=devolos+qr+codePDF 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_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 18052 bytes
SHA-256: 4bd1046ec34c7ea8eb659fea945905751299822098bf7c08a15bee760ced3c4a
font_01_sfnt_off00010eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CC 10120 bytes
SHA-256: d73a04ddc78542c6b33b586f6d961641ddcc47c8fde3c3f4f46cd90ae44b5cdc

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