Malicious PDF — malware analysis report

Static analysis result for SHA-256 074b1f444806d771…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 08:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1337c6aa4b4e8ab225a61662d546ff76 SHA-1: df6c21c583cbfd01b889ed65d859c939c6405332 SHA-256: 074b1f444806d7715865d11db77f8c3f5b37a4266a89c525e638ae77f2cbd77f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/2lo8m96u674fctnrvlsao15m24/18561966987.pdf In PDF document text
    • https://digireg.dk/upload/79620243445.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/ronunusud.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/sujnqqsrmaerhp1qgvjemgfgnd/37219828009.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160917e2f99ae6---22527026472.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/37148526877.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092802230487---bovex.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nowanoxixeguniniwiv.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/66973664554.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/wadijuj.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/mufaxosuxerovazimivefu.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1192b6e642094745ce0bebccb58a1fbe/kaluvizogad.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/17448227344.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/14324914032.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/gopagemerupuxe.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/29772236470.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/zuliji.pdfIn PDF document text
    • http://faradbox.pl/files/file/51548476947.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210813173450.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/baxorakiwuboxogelil.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/voximes.pdfIn PDF document text
    • https://emmaushuis.org/pages/gufesofoxido.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/300a455920dae6052fec271656eb6352/deletokenexuva.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/vesokasaronum.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/dabotuwafuteporetigojewer.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/75268549048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=kia+saltos+gtx+plus+diesel+manualPDF 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_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 10828 bytes
SHA-256: 9ad69c843f843fdcd7c049f70dda93633ed39cd0aebd005dc4b88047a2f25b18
font_01_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 17620 bytes
SHA-256: cd333a093c8d4ffff9816da7fa650f13896392da03f306ef96e6ab6fe07d873f
font_02_sfnt_off0001223b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1