Malicious PDF — malware analysis report

Static analysis result for SHA-256 c899283059e363e5…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 17:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 79ebf52149c8afe80479e4652010cae5 SHA-1: f3a1ca6ca3515df8805cc794119a183102dc4c76 SHA-256: c899283059e363e5a656ce50db65db2a8625d5257bf0741ee5a16c29aea3b3a2
132 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4121

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://isleo.com/i_photos/file/76005207457.pdf In PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0e4f8fb89934e4f6b2be5954aa9e475e/60576615654.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/75636350965.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65c082b6ed---medifotejokawebeg.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/af2f854fee959dc96288ce7102f98592/penirodugoji.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/75087235761.pdfIn PDF document text
    • http://emannsltd.com/userfiles/vojojiwalajunovu.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/72874915886.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e09be9b41---jomopelovurokegagakab.pdfIn PDF document text
    • http://atek-ent.com/upload/file/59738542559.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/3636852081.pdfIn PDF document text
    • http://beijingteye.com/upload/files/2419175832.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608840758dfa0---nonemekozezemotaborolulis.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/modetaz.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/nasil.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/dukato.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160db3fc25debe---52237885963.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/63793092034.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/revuloginilimosawom.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/i0ee2hfm08ehtpii0vt0sfgt96/towaguxozupasejivetasu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1jr2el0n22ol3rqh35ks6eqhu3/76077264919.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/raliwarovul.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608723ffdc779---47714223455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=edifier+s1000db+manual+pdfPDF link annotation
    • 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_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 10840 bytes
SHA-256: 9f8152c589dee7ee03df2142b42c80635c77bb4dba6291fed03309261d9271a3
font_02_sfnt_off00011e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 20828 bytes
SHA-256: d3d7d95f3b6d946d61f30614eb1aa55d4edcb92a9ba17b2f1c1b1069019c7b65