Malicious PDF — malware analysis report

Static analysis result for SHA-256 e850a0aa5ea7d6a3…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 22:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 107d09e60a04ae262f15371868a95fe2 SHA-1: 60e0e18d85d3243c6b871d663103fc805459c5cb SHA-256: e850a0aa5ea7d6a3e46408958f91c096a9dc89103fca42c410413d73a7fab1b5
132 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3253

Heuristics 6

  • 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
  • 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://pixomot.ru/uplcv?utm_term=top+ten+cricket+games PDF link annotation
    • http://shmgec.com/Uploadfiles/files/45608148967.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/89037154526.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/5174746019.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/1oif4l6agsucovcts33ovuigt5/xukugejix.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/99895642728.pdfIn PDF document text
    • http://halanmilk.com/upload/files/rugekivamajuraliwuton.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xominosupojifedes.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614766b02a77d---43493725051.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/55439375022.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/navenitopowowiwugapiwav.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/17427233470.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/78378536579.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/vigomasimamamojavu.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/folaxotefigegagefurojixiw.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/10902006035.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/wafunozupi.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/3051269239.pdfIn PDF document text
    • https://pellevah.com/upload/files/35232205377.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/watodabarokesot.pdfIn PDF document text
    • http://chenruichem.com/upload/files/56945176243.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/fudorafofolotipalovud.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130cf11a9770---laxafowavena.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/xokojiguvimusasijo.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/59190210067.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/fugujerigix.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/50057727573.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fea8c922b3---gezebo.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210909070050656.pdfIn 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_off0000d4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D4 17344 bytes
SHA-256: 6deda1068b8faba6db259b8c5e776c8a6da0e046d985dfe1c6b20e5b97341a58
font_01_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 10728 bytes
SHA-256: af40e40a360654aee365d5ed0be8dac1d4888279e6e26d453ae9ff76cfb14eed
font_02_sfnt_off00011abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1