Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a5e5c86f9c3df6…

MALICIOUS

PDF

83.7 KB Created: 2021-09-23 05:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c942e47b763ff4ca5dd50d0b638e4efe SHA-1: c375724658a6f07353009a7f260daaaf392d02a9 SHA-256: b7a5e5c86f9c3df6286b416da3778f64be16c5a196eef4ca74a73ea66578bcc7
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, and exhibits characteristics of a link farm. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of a 'robbery bob mod apk download' URL in the feedproxy suggests a lure for potentially unwanted applications or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://birons.net/wp-content/plugins/super-forms/uploads/php/files/c9f88af49516212b211a8d9e5e91a7ce/bitawuv.pdf In PDF document text
    • https://olterus.net/contents/files/mupefibuzelaravina.pdfIn PDF document text
    • https://96662888.com/editor_upload/file/nabagewalenesar.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/28987249135.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/27244654366.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/rejidufokafipa.pdfIn PDF document text
    • https://slide-bearing.com/d/files/42726959274.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/59184917743.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/96266882612.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/wudega.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/12098964316.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/71136158266.pdfIn PDF document text
    • http://cga82.com/admin/File/15927741650.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161306588668f1---59952397960.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/tafutafuw.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/funowu.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161382ab3eca4f---52711779780.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/97a8f5cde23ed2d1d4fb9366f1a417e7/futon.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/ziwugusex.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/nisagaxevefagatutuxepi.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fovotajevejagoxaxib.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9ffcc792996a47d0548090a2a97eafc7/migigejuwupajadokidemu.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/dexunubavakalajomonu.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/94850714959.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/zidutotupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=robbery+bob+mod+apk+downloadPDF 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_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 10672 bytes
SHA-256: 93adcf7415b4da9f23e7398ddb635bb76978e92fa99d81f9b7912ea237de19da
font_01_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 17964 bytes
SHA-256: 84246a3acfbae8b0a225d258758a7af6c03b4aa86d1b114b4b87b2a05e4956ef
font_02_sfnt_off0001293e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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