Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b05b0b581732de0…

MALICIOUS

PDF

83.9 KB Created: 2021-08-31 13:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a532876a857d3e37811a1b4f8427c37c SHA-1: b57693371ecb1f70812ff7a59c6da687b5ce26d5 SHA-256: 9b05b0b581732de0faf5f46bed89c4eb7c7f8011c49cadb7724e4940e8f9b223
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as a phishing trojan by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS uploads. The presence of these links suggests an attempt to direct users to malicious content or phishing pages. No scripts were extracted, but the PDF structure and URL distribution indicate a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://indyztyle.com/ckfinder/userfiles/files/65328589779.pdf In PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fef4c426ee8b9f273553b4f8dcd2615c/dupiragaxiboturop.pdfIn PDF document text
    • https://mahae.hu/files/files/kovonib.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c45331318---62715325917.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/38107479561.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7c94b1269---zajilik.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aebd9108e5---givolozosajik.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/lijabenepo.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/mulekebenixuzirutinaja.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/32371915668.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/dakilo.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/ropegewamomeriwasokimafob.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607addc24d8a6---fovimomuxudobavure.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/21216549244.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/wijedive.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/godeg.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/rovibepokepiragimi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/36ff908851a19897d59fb8c01066cccc/zabopusavatatiged.pdfIn PDF document text
    • http://imaginove.eu/data/Files/bobitamimasoxonozop.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/zubepifopesetovexibizawi.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/xuketibojaxuwotusajadoruv.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/dupatugo.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b00488dd0a0---lumivimeru.pdfIn PDF document text
    • http://thaide.org/userfiles/file/lutafakel.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/joradononegapusedix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=dungeons+and+dragons+manuali+pdfPDF 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_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 18480 bytes
SHA-256: c056baf46fce7917d2befed26a08f0bd14563b9bb1ecb54edc642b52766fbf2f
font_01_sfnt_off0001108f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108F 10844 bytes
SHA-256: d073d667bdeea8b0a8d2443ce35b5736a4d7eb0f934695539d22bd7566fd93ba
font_02_sfnt_off00012953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1