Malicious PDF — malware analysis report

Static analysis result for SHA-256 33062794bc760439…

MALICIOUS

PDF

101.3 KB Created: 2021-08-07 17:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 4241cd174336a911a83626d36e545497 SHA-1: 543858841f01c1f24b83095a4213b01b6f7f687f SHA-256: 33062794bc760439fca47dcdb8bccf0fbecdbfe972cdf21f52955247a814913b
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised websites and a deceptive download button, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=ib+chemistry+hl+textbook+pdf+download PDF link annotation
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/297c277da48105b0e5c53380b614c78f/92550424234.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f40cd1595f77815887d9a0d7ae95bd6e/54130426743.pdfIn PDF document text
    • http://knoxvillecentralhs1966.com/clients/8/8c/8c0a3a1fea337096d337135aeb812fb1/File/94659007147.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-30/20210730020224799864.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c58d8cea2---59655099736.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/17815476695.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/31471410450.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/7727p5s8eva1q721l0e0uiaa4u/65069417603.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/tarexuteluxunofix.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/55987826185.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/3e0bbmth3lmlpb4a08s05tnsuc/jitobaxizuxire.pdfIn PDF document text
    • http://progetec.org/userfiles/files/22615379065.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/jorumimusaduganupa.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/35945992013.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/zilefoviziwag.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/92999479126.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/semoda.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc34d02fba---rigazib.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/miwiralegamowipe.pdfIn PDF document text
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/8374221178.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1d5dd92ed---18118986098.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/rirorewesezepiligisup.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/jodugojaxiwabimiwojisas.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/monibedobu.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 18044 bytes
SHA-256: 1ba0a8e9b08dae4126e4a716d02e525a7cf138785e5bcafb72675e7ccf72fb1a
font_02_sfnt_off00014ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA6 10292 bytes
SHA-256: 2a5bbf439ee6640dd01431becfb44c25569b33b8bbd89507664ae57cd83b6400
font_03_sfnt_off00016c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C7E 11368 bytes
SHA-256: 241bfa9a68cb464e5ab21f59f3dda70dbfefb2f9134cf3854a7240d78cef881c

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