Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa70ddf3f29e105…

MALICIOUS

PDF

94.1 KB Created: 2021-09-21 01:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 388cc63954661a2876940d4a37da8253 SHA-1: 9a1adb5c7318ae9f2825baaf4091ce7415d34ad9 SHA-256: 8fa70ddf3f29e105aa14f81eed9647bf52831d0a50766b9dd8479f73ec60a943
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/jojufilukadolunu.pdf In PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/zorevekal.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/31948574894.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/lugukuropuxa.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/12885678643.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/mesubojo.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/sakotediziguburiz.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/lonulukusinekexuzopoxo.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613100bdcfe0c---wabizomori.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/vezotiwameki.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4688fb5a2284485456425c40fecbf254/risoneponowijumudij.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/gesusaraxu.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/xupowapeki.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/giloka.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/sumulixovolitokarakexu.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210919025253646871.pdfIn PDF document text
    • http://knipia.com/userfiles/file/81483226589.pdfIn PDF document text
    • http://saimiri.name/upload/file/49054694901.pdfIn PDF document text
    • http://yoron.net/up/files/surorujafanewuxugafegex.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16133625db486f---lawemigadetalenefapona.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210902110930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+best+games+in+the+world+2021PDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/33677327415.pdfIn PDF document text
    • 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_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001210a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210A 11176 bytes
SHA-256: a78a3ca8f1ed52a7e1f21114c957f88cdf7a925ed1ed8e1f3b909b0467aecaea
font_02_sfnt_off00013ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE5 18288 bytes
SHA-256: 48b4b34d50df0bc0c9173babc966c36c86fe11a986143f07fec4e7c3a721564c