Malicious PDF — malware analysis report

Static analysis result for SHA-256 9148eb1690510df2…

MALICIOUS

PDF

86.0 KB Created: 2021-08-26 12:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 26f6a5dff2e43a43d99f1d94e58c9b3d SHA-1: 1019b5ae29d454d8052f9cd6f6b36bf1f8aac40b SHA-256: 9148eb1690510df2e1c4e0dc707d2b8a2f6f93fe67b1ac69f1bb39b868daada6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be disposable or compromised hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

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 https://coretry.ru/uplcv?utm_term=the+insolvency+act+1986 PDF link annotation
    • http://tnslib.net/userfiles/files/genetiker.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/lusazo.pdfIn PDF document text
    • http://metall-press.ru/files/rufopizi.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210615213301_upfjhn.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/4556637787.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/xukafevomed.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c82c4ff4a---kexazevixomuvivarufarulup.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076051d08d8a---gevub.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/mujojefatubaweb.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/313a3e54c1bd581e18453fb2113cf545/silul.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/jobonude.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/ludigamozafojaw.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/xitakegijubuso.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/xuzamagaxumiwutugetimigo.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/064b665b18205c9febd249f7a3eb0d03/40180836778.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/nolijot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf23024de6d---99639151364.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/novuvuwopetowilowodu.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6cc38a9c62cd1a05557c9da08da86720/8404728209.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/vidoxumariwurujedatix.pdfIn PDF document text
    • https://digicpictures.com/downloads/fofidukozatenisaruwa.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/51231524992.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d09010bda---tefasamowovumalez.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/35828108101.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/lowad.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_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 17212 bytes
SHA-256: 94b337ed3ad0efb6923c7d13df93d07a0a99190220f661d028cbe1a0a1bec0d4
font_02_sfnt_off00013059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13059 10964 bytes
SHA-256: 55827f597a76891911392c6c43e0a526a0d45337c40362df2a46b057a4e82bb9

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