Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70158e0727728a5…

MALICIOUS

PDF

92.0 KB Created: 2021-07-20 09:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 351ee22675f50403a7c7c6edabcbac5f SHA-1: d895bcefe0ab2922acf13fc87ecd38d7ac1a3572 SHA-256: b70158e0727728a50be7307a22b03ae8db603f522f2f74d14e20a5d836f363f9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e74238176d---niguvepa.pdf In PDF document text
    • http://cecev.com/stockages/files/81047187657.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/ronugugeminomufuwofokuzik.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gimesizajadumotujutimideg.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/benexiwiwijisojivo.pdfIn PDF document text
    • http://cortabellanews.com/userimages/fodabuvoworode.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf219d4227---tafol.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/zefubepex.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa07d6d7142---vaweki.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/37c88e4f7941c89a8a7a806ee8b519dd/lutegotesede.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/sesumifufopu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160edb7beacc8c---91376123663.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0991444d2f72d3d5f50b0462baba3f47/83918118422.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5f3b7f87f02d271f2d6db0079ae7cf14/satuditupupomowa.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/bf1c2c0fe7822e50eafa8ab47f3faa91/gataluduwugudojunukujixax.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a59efa5540a---ladegeliwoxivevob.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160948b6abde4f---golutiloza.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210518232315_a4s8z5.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/xevubane.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/19413626345.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/timuxilalas.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/2481286160.pdfIn PDF document text
    • http://chinazzjx.com/d/files/31216558682.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/rikumomuwamesafowozo.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/54073996928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=lords+mobile+exchange+center+codesPDF 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_off0001023a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023A 17884 bytes
SHA-256: 530062ce7ce8bc16cd472c0f33b2a07db03e31c703fee6f19fb2b1cc8546e054
font_01_sfnt_off00013174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001498b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498B 11016 bytes
SHA-256: 4b2af1dbf3816a6e936eaa820e00d1157b40551d8725d04ce45102074b21852f

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