Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7a4c823df85779…

MALICIOUS

PDF

99.8 KB Created: 2021-06-27 13:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d3a5a0b0af9fbe83a45283df29ab2df SHA-1: e57f9b890e02c61363e602cfc36a9c7b9e55893a SHA-256: dd7a4c823df857790bc1817f29e639cc95a38092d25f9d045ef4c84e69d952d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body is heavily obfuscated, but the presence of external URIs and link farm heuristics strongly suggests the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/aqathrcpfcdqsv64cle878ee5p/21090707557.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c13b6321bb7---budijiwuxozova.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b4e01a2297a6f2b4d14bcfcda3e29ad0/98800719429.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/7a95642a986625dc3bf0a65930193035/5835427208.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607801462c528---58587560466.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e17bc55bd64f42973e787cd65ff45981/fekeganubaresufuwopuw.pdf
    • http://weifong.tw/fckimages/file/vivakarelisurijijosad.pdf
    • http://boldogelet.hu/media/xewezas.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078489a4f532---kafoleluxako.pdf
    • http://olympicburger1988.com/uploads/files/57674586009.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16090fbd2f14e9---xagizolovumomavoxewo.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/b8ckq1nggs8sp7bu9atju1lvg7/48391876029.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/i6s5f6coofidmino0rgvvjmt3h/jaremabunaxoworotugew.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/8af8d8ababf8f43bdd96da7698b1e7a3/sixapadumosilazo.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084d179d6bb4---14708026124.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/pfm0tcdf2vg2rahbic3euok12i/44712273602.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b99f58ac0---6226366054.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ce26f997---80219369766.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7610c1b33---fewabida.pdf
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/79626679622.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sample+paper+class+10+science+2021+with+solutions+pdf+download
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dcb393db8---18669077149.pdf
    • 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
stream_003_off000133ce.bin
8dfc4682b4686da8d8c65741ab5aed9181529dec7d7ff9f6f5d8fdea898dbf9d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x133CE 19512 bytes
font_00_sfnt_off000118ec.bin
84a85173711766d8bee4548d5c99030631fbce1f9e203289d7d3d7f29b169800		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 11440 bytes
font_02_sfnt_off0001678f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1678F 16792 bytes

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