Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6ba32b3b5d9111…

MALICIOUS

PDF

103.0 KB Created: 2021-07-27 06:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 74ed505c52be43fd4a3c4bc11ec7eef6 SHA-1: 21a108c56add8a7795be5f84a0e979e88ab04a69 SHA-256: 8d6ba32b3b5d9111d323a84ecd19d193eb18f7de69c7e196e679cef4eda9dad8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which appear to be part of a link farm hosted on potentially compromised or disposable domains. The presence of a 'download button' heuristic suggests a lure to download further malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chapelguild.com/images/usr/30439153607.pdf In PDF document text
    • http://amajyuku.com/files/files/56703896927.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16077f432c6fd1---79119158580.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/bufugirepoduket.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/maxarukokito.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/56a461cbf389f74405d44ceb34c03d9e/6122032846.pdfIn PDF document text
    • http://sartor.ru/upload/files/veradokojipamit.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/rebewosilemibusavetixus.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b8812ee2e---nonulamapel.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078cb33872d6---92652316362.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/si0sb80afsgr133q6bh8jlcsj6/ramavu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/747e437d67ddb96eac0b19c022586d1a/gulojixaj.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/36f9e32f6b3df28053b6a1544dc47c88/23110589411.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607585c229b3f---wefawufolikebodovajodof.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/74510115586.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608502b2ca552---zosoxafetetobaxinokisix.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/davagetajadedadi.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/79776796695.pdfIn PDF document text
    • http://mosjob.ru/images/file/64489827843.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf425375b---nokozozafaxidizufufusuza.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/57104635319.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/49544624398.pdfIn PDF document text
    • http://ipllaser.in/uploads/xosojozitojakig.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lirafuzilizulesokegel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+get+free+skin+in+mobile+legends+2019PDF 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_off00012564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12564 11308 bytes
SHA-256: e8bd4c7ce3159933f3095f7fd9940ad33806163b20f94440dd642b8d77eebd5a
font_01_sfnt_off00013fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC9 20096 bytes
SHA-256: 8790839e1d189e3bea8000aca7cb80cd06999254c74090be95127455bcc9eb7a
font_02_sfnt_off00017591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1