Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d1e022a74b5a70…

MALICIOUS

PDF

101.3 KB Created: 2021-06-25 13:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1b4623a7c7b7fec5ab6a65f364d103b SHA-1: e415fa73ba7f8fad7d8cb467fb34a17e42423d54 SHA-256: 84d1e022a74b5a700368a551470603a8ce1538a5cb1876b83f01272b87606de2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning lure. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://porterbrothersltd.com/app/webroot/uploads/taxazavewewuzeru.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3879a3deff---somakidot.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3d3dc7039---butinumadux.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16211016330331.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c68bd2900---telizebufularowinaputeli.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/2645ffa541ce491daf4acad191687e1f/punerazetidinemito.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/rukopabudisapen.pdf
    • http://aqbnb.com/uploadfile/file/20471136385.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/uadbmj5mslm1sqm8lns47400p5/30060858105.pdf
    • https://newtech-utm.pl/userfiles/file/rutedurukuratetejozozugiv.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/2vfdi6c976jeocr7849hdgb873/wezakazi.pdf
    • https://classconnbio.com/img-jacson/files/24614253565.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/gio1mfohm15tjc6naal4d14mid/49955148731.pdf
    • http://worldofpacifiers.com/editor_uploads/system/files/90579561660.pdf
    • http://skogsformedling.se/bilder_umeny/File/26135711016.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849cb68bb45---lufebelurawosen.pdf
    • http://beta-rc.com/upload/files/kumodoziruf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=square+cube+table+1+to+30
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001271c.bin
8671cfd1be2018b4cd2d4ce7bebae8918d3d3fb2abf4c98adc73d0a9ef11dd29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1271C 18524 bytes
font_01_sfnt_off00015787.bin
b212b1e82ffe03f4e0d5e8508ac39693d4b39bd7eddbd80a42398fda66de0850		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15787 10668 bytes
font_02_sfnt_off00017032.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17032 16792 bytes

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