Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cf56dea7e2b6b3…

MALICIOUS

PDF

72.8 KB Created: 2021-08-04 13:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9e733bae57e7311d7a03365d7a5d7e70 SHA-1: 3e1faa489199f953641fb78186be72bbcab5af33 SHA-256: a6cf56dea7e2b6b3954e54b457dddb5f1a2a0eda42fd6e1186f4ffc80fc6fd92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://kapelski.pl/userfiles/file/70634234864.pdf In PDF document text
    • http://trustarshida.co/cache/fck_files/file/4980367082.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a169cb34852---kaxawotegapug.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/52052411837.pdfIn PDF document text
    • https://masihpt2.com/contents//files/34800601147.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/rumikafotodowo.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/98868582659.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/tetulamubodiba.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f7fd8515f---72776964423.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/1d76ssq5k6bojo8h4gcbfe89nq/kegiranenadifa.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/sbb8pr2v13dclqla8csgr7ph31/74459033579.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/wobutezeladobizado.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093b874b4f43---natakorujobaxeteraweve.pdfIn PDF document text
    • https://ultralloy.net/upload/files/revoput.pdfIn PDF document text
    • http://dienmaybaongoc.com/ckfinder/userfiles/files/gilegutawojenomebap.pdfIn PDF document text
    • https://comiconfezioni.it/file/zazusunisewuxopufone.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/volasitizivanazirezad.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce91598ea4a---8383691723.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/ed1418f5923cfb874dfff9dd9a6c5848/80595890607.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16109d6e1dcc47---sovikapez.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/33254717889.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/mutoxaresibe.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/b0119f56a69364fcab74bd67cc60d40f/niwutuvunufaxukufodekam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pokemon+emerald+download+for+androidPDF 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_off0000bbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE1 16120 bytes
SHA-256: 9de75e99f1f3ca9932632f80f0d9629061481ae063e0dc53d02e94cd4a209a66
font_01_sfnt_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 10428 bytes
SHA-256: 863241717f0f9df8f4fe219d48a37bfe3b2f3d8af07e6a1d9ba036f42b5149a9
font_02_sfnt_off0000fd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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