Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a1a3e47eb0161a…

MALICIOUS

PDF

73.1 KB Created: 2021-09-21 16:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f2c499f4014a1b1f30808e149205a0e SHA-1: 51897ee436ae3523b1b396a9faa578a8a08ffb59 SHA-256: f3a1a3e47eb0161ad1a69ed7889881537a7404f1969564d1fedc58e67ad36c9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=install+outlook+365+on+android PDF link annotation
    • https://satuldelut.ro/ckfinder/userfiles/files/75406332621.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210917115408.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613953de28258---98848120917.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/27435241534.pdfIn PDF document text
    • http://tabletopad.com/images/file/93221182390.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/12760457824.pdfIn PDF document text
    • http://zamgph.com/uploads/file/020955486464.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/54494577131.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/66195553702.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/53203254397.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/pokoroxi.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/vaxikaniku.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161443a8fe066d---fugiwefanamup.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/41445628506.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/1279895755.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/34849569672.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147435409ddf---9273975967.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/36377053905.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147a5438cc15---tevovuzefakevagobixup.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/27906791056.pdfIn PDF document text
    • https://soechi.com/userfiles/file/1832809379.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/lugawitut.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/70428422810.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB904 10724 bytes
SHA-256: 5a88a44b0abeb2a3ce3ea5e359ac799e8f3291d753bd19dd365bf2562249dbe0
font_01_sfnt_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E7 17472 bytes
SHA-256: 958dd162afaebce6cdd684869bc8cb76df26f4570f432fb255c2a217c6ed5a6a