Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacc0a0063c0c3ff…

MALICIOUS

PDF

107.4 KB Created: 2021-09-02 20:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: affcece750358360ada0597fbbfbcbfd SHA-1: 80860cb7e56dd72ae16951e88eee9da2abfafde2 SHA-256: aacc0a0063c0c3fffa989f84eb635d36211ca953f3476930864df01e622b3b77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads, indicating a link farm designed to manipulate search engine results or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://smcertificationservices.com/userfiles/files/dawozasejuvuxesezajekupe.pdf In PDF document text
    • http://szentimresiklos.hu/upload/file/75678571899.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/5607645241.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/40371607528.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a33961ebfb7---59559483035.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a830fe48f6ebcdaaa2d13a602b6d8773/60622999369.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/bojakituda.pdfIn PDF document text
    • https://landi-bg.com/images/file/3891369407.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/488e912e08a834134d76db8d2f9ac83d/58561147652.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/46c0e4c7a88c8a9aa9c68abcd020acc1/fexuvatijisogat.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099ab5a1cef0---67125547087.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb10cc8ef1---loketewofafekalad.pdfIn PDF document text
    • http://greenreunion.org/clients/f/fd/fd69eab1634eeea6368acebbe5d5cb0d/File/zelaziwidaka.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/pinowejeduriweduderunelan.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/voruxas.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079c813a3193---nagemujoxazamokixoba.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/13251641660.pdfIn PDF document text
    • http://apvn.info/userfiles/file/94806821795.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1574cf42e---zidelibuwi.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/nowodugogej.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/ruvunifekisijefoze.pdfIn PDF document text
    • https://toocapen.com/files/29306763694.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/beklaemamd2o5gme8p45hg216u/75034017693.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/33739880825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=glasgow+coma+scale+table+pdfPDF 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_off000139a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A1 10932 bytes
SHA-256: e665dc9ad6751a9ec9cb29e94dc1786d9575e495cfe832fa166142c5112c3f77
font_01_sfnt_off000152ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152AE 20204 bytes
SHA-256: 5f31f27eddfddd629efc4ff040aea5e0e478bda4855be00712dcf00ca6ee4dc6
font_02_sfnt_off000187fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1