Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f3f7d739b6fbab…

MALICIOUS

PDF

79.7 KB Created: 2021-07-15 17:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b9cd54d2d2855f3c9c10328ab87e2785 SHA-1: 1b7ac66a134cf49454cfce3548d4c1b4b6a0e5e0 SHA-256: f6f3f7d739b6fbab2f5d6c6f0c20afd2b2c74755163a1ce0f7c02b3f99b120bb
154 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 and ML classifiers indicated maliciousness. It contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm used for phishing or malware distribution. The PDF's structure and embedded links are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5252

Heuristics 5

  • 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.
  • 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 http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16071d111be998---31362438937.pdf In PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764dcc5276b---63484342009.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dfe54b930---musujevumoxikiwopazorod.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/vijekiletabip.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869af2ad9cf---87837870917.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d74707a5089ecf4c82dc28e3aaea8f40/dabinagex.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/m96tg3epfbd80uqlcil9u3jt31/49573270746.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/t6pdii5crpdccplha1ui1c3u5l/gekixikun.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa57d51c9a---150724931.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/2cb4bdd4c7c1f1f2955e086212ff76ee/rixitekibisibe.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/67536121ba1638799fb7cdf53df87375/sazix.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/2813843114.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/000edb25940749f6ede34cabad5555ce/kokunurotunavitoparifosax.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/93266192519.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/fih3vc1gk5l6u2kb5bgcl757c3/29100848726.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/55041185786.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/34140696103.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a5e63c31a---24696970909.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/xokomaguv.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89de94b0f---21887197144.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8d6c1f05---44180958688.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/64302820500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+probability+of+getting+pregnant+by+precumPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 18352 bytes
SHA-256: 976449c2381fdbbe7952104a8925788bc68175e1e422dd4a001b4da65ea48095
font_01_sfnt_off000121c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 11076 bytes
SHA-256: 9adbea0d43780110cd5d51b46abe6a9d0588daa25cc15c43c627b329a36894e4