Malicious PDF — malware analysis report

Static analysis result for SHA-256 07da67a85b92c5b2…

MALICIOUS

PDF

71.4 KB Created: 2021-10-02 09:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5347538b94a896ae2fadaae70465407a SHA-1: e81baed555f40c09f08ead4fa58e611da9212cd9 SHA-256: 07da67a85b92c5b216895f8313d94d1f81e9d6c08fccda9345d36946950c3e08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://oniceh.ru/uplcv?utm_term=perforated+gastric+ulcer+treatment PDF link annotation
    • https://nepalimodelagency.com/userfiles/file/topinoxivivegora.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/taxibifov.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/dowimajafusimeloz.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/551167738fa6deb805634e927d783628/bedarovedemaj.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/webubixakojugexo.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/54612964830.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/kisijegam.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/piretikawoboler.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/berufunojakolatad.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16157ac4573440---jojer.pdfIn PDF document text
    • https://pincodehub.in/userfiles/file/84347091746.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/11f4da05ebe5f6bec9c8e996d9ef6181/84240945566.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/63968440365.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa4be96af---femogifopar.pdfIn PDF document text
    • http://symbolfoods.com/files/file///ropejobanewuxa.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/qpqku77qlgtj3r3h2q89hfru22/95866953447.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wetorurekiwagigu.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/52461828652.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/36216999359.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/28120736362.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/65682380901.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/20603350888.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/fibijewurudavusabet.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161474ae721694---sudubetetemoliz.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/70980123165.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/40826098784.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_off0000b481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC93 16328 bytes
SHA-256: 8ebe2c1a6b4701f980f19a9dc54ef2f9a129ea4c4451ea858a45302f95c059b3
font_02_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 10920 bytes
SHA-256: e077aa64f95445fde436fbf30d1dc32f38936a920cae74101e05d8c7c6df4e78