Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc1b0cf5986163c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 02:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bec6a945317520f0fd3cd9ac19c1cc63 SHA-1: 099fb4a68d2da1ee118433b7ffaa3189e38fbb79 SHA-256: dcc1b0cf5986163ca1294c869200e216ca97e03885d8153b2271f88cc25eb317
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supporting the link farm nature. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://essaidafm.com/uploads/FCK_files/file/nawozedotaviwer.pdf In PDF document text
    • https://michelbarbot.com/upload/files/rasozuxajunafibomoge.pdfIn PDF document text
    • https://badrivishal.com/media/pitaruxusuvurus.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210714_1C862A5584F3F39F.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/pajakakojux.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceb6c6a065---kakibusijutubi.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/kijuvoxijozukamiz.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99ca0a45c9---76293681096.pdfIn PDF document text
    • http://canvangdientu.com/images/file/govapepu.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/netuwovudezokefumag.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0bea2741764bb02d1914419a15577ee2/96229023152.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608462b3e6962---9114971120.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/woxamutubig.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/62998636969.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/96951699350.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/92783901363.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612c3a51ed558---55345154048.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/sunebevopepatigaxifawus.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/65446718269.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/83f7af88b0abd5e8bdb36d5ea7b6aaa0/jovojikojufar.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077cab516d96---sojijuwagunuloz.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/63455722155.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/88869859255.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/31996325143.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdd6b30ac3---fojazegaliriwupux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=simple+self+introduction+examplePDF 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_off0000dc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3F 17560 bytes
SHA-256: 01c848d6221125fd63e6d937446d3e474acc3f322fee0c1ad3a50740da86f206
font_01_sfnt_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001213a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213A 11056 bytes
SHA-256: 9d007526abe423ae23286297a59e9a53df9848d9f07fc5d053f8514a8e9077f9

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