Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb658e14af8f0fb2…

MALICIOUS

PDF

91.8 KB Created: 2021-07-10 09:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9cbf479352773176c58dc6c0a44f69e0 SHA-1: 4b0be1381676bdb2f917da915cd90f204f77646a SHA-256: fb658e14af8f0fb27d84e344fdcf9153438f03108b057ff3e237515fdadf63a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=40+day+water+fast+before+and+after PDF link annotation
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/mn02rpb77lc9dskciieekrk913/fotupukukefozamujidalipot.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/denane.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160983bbd78a63---ledowafejiravuruxa.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/27297096370.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/23472247743.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c95385e23ecd64639bc0b084247ce21c/kajuzigogubije.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/3164978038.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/revuloginilimosawom.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/newavajaxevixavev.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/b8d1b1449c22556bff29112d1c84fc6e/96971696101.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/wedovezupotoz.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/11289155471.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/guwup.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/c95049d34aafd697e7f61c594c5fe086/35993134906.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089726fd0053---80774188654.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/f166cfbd4fd946e1c8491424122dda86/28806477897.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad59db37dff---43194171653.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/82176122092.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/satilupimonuponijes.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/60118415f69f46a39c180ef70e6c450d/sufifanagunuxo.pdfIn PDF document text
    • http://nipissing-lodge.com/clients/b/be/be32fa5c9d1e5a871f1efa0d35b29fe7/File/55078741841.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1809012d0---54705409148.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/64641367805.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/wefakigopovologobulup.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/86409693768.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/219b2svcsdbci03bicoangp196/20665670421.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/47343993555.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_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 10652 bytes
SHA-256: d2cbe2a6563c60a248a59c39bf2f4b0ab852c107330cfc9a157ba4ad4f2b6e43
font_01_sfnt_off00011e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13678 16716 bytes
SHA-256: 61cd80a57a8039ab267ca2a99840fec0e2c73f8ede8c7640da6056f33d44d01d

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