Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8474a8a0d1b17da…

MALICIOUS

PDF

85.0 KB Created: 2021-08-15 23:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 8c8e36551ec6158fd50068d18bf597c9 SHA-1: df2c899733ca2556e66ba0159bd47a128b6cf24d SHA-256: d8474a8a0d1b17da5f23ab8e71107854856e76b304f61e2a67cc3ed245f7d517
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to potentially malicious or phishing content, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a65d7fe9e97---ragusigeko.pdf In PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608920a386021---50427676047.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/391025114.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3e780d4f1---97976369475.pdfIn PDF document text
    • https://inks.bg/userfiles/file/49401758331.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8959b4ae---mabojebazun.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/vodabikagipamakoxa.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/37529513504.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/44106412895.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/70721061737.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c2db48aee---xipokuguwolilima.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097581861ea5---vovunurulumimexelonukev.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/cda2271d65d8814d67bad3c0734f5e9b/91163271750.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/8e5aaa6b82697e7ca234add1f4f78bc1/dilakurimakurid.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202106/1624097812.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/vugitesuka.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b835f662---36340062121.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/biludapunu.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/8779930216.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/52648618717.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/77179950050.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/37969346702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=baixar+bluestacks+2+uptodownPDF 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_off0000e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 18488 bytes
SHA-256: 6b379eacc7425cbd0d33f10fec76154f8ac26910baa7d944f287d01ccd1098d0
font_02_sfnt_off00012c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6C 11200 bytes
SHA-256: df69fb4d4926a80f1701fbb050936652bbdf72e1ea1480de5b5c34f2408e71de

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