Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4345db2008a9e75…

MALICIOUS

PDF

84.3 KB Created: 2021-08-17 07:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2f4e8c02e838be589eae9e8c9d68907a SHA-1: 950425c3dffe1ae1a4ca51f153b1c4a3e2482dc0 SHA-256: b4345db2008a9e75d3822c8fc5fc8c3f44829c44d2dcfc6f9026cf5509a92936
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm, pointing to multiple distinct hosts, some of which are associated with compromised CMS uploads. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites, likely for phishing or malware delivery.

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 http://c-amc.com/upload/files/mumululagowimelukopenonu.pdf In PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/197664b7213ae59e311f95e113055b10/tusujekiwirewonemi.pdfIn PDF document text
    • https://eternalbliss.net/file/78665148805.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d60f4226cf7---35259261667.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/nuwotiwijo.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/51490428626.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/723092e244ed9c8b83f304d13e19aaa0/28518229688.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9543cbb0fa---62338750811.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/69b85f2da61ed026c2769c47d9909d2f/51422945846.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/11625273671.pdfIn PDF document text
    • http://sdds.be/userfiles/file/fenokesifatezatitugo.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/juzimuz.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/13042456726.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/49605425954.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rinejakexi.pdfIn PDF document text
    • http://polletnv.be/uploads/files/83114900756.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a6a4e2301---24548164148.pdfIn PDF document text
    • https://cet.sk/res/file/warudetenuwijajewim.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608150656c365---jodoretanu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/de3a1c5e95720cf403bfdf8ab4e22477/vutofiwutixuxade.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607999a7cf09d---64644100687.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/nafijunolidu.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/30205888965.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813db6e2383---busumifewona.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/xizapadujavawefijagagusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+use+cobra+25+ft+drain+pipe+augerPDF 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_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 11320 bytes
SHA-256: 076cd26d81cca9ffa4841df2c0536a4e78190557212fb70c636f081368d710bd
font_02_sfnt_off000118d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D5 16484 bytes
SHA-256: 8555af7728580dd3ebeec0838d1cd43996b5441918247b1a2c0100c2041cc40f

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