Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a18f3f4b3b5c88…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 09:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ecc92ac9ae5038ab1ea93cff0d3ec604 SHA-1: 3e3904b932a5fa8ba1a4c3fda4ec42be31633b30 SHA-256: f5a18f3f4b3b5c88d445d89fe9aaceb6855d4913bc1788b9594db5c6424c7d69
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly indicate the PDF's purpose is to facilitate access to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://pixomot.ru/uplcv?utm_term=the+god+of+the+witches+pdf PDF link annotation
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/74778409133.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/91377099451.pdfIn PDF document text
    • http://varvshistoriska.com/file/vofewav.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/mizakas.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210919175900.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210921073105_1479694465.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2jrapr985kkesn7kubakkfqglh/kiwajalufawo.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/latekefesufugepi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131404e952e6---potejidabukosamofulenozoz.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210926184325.pdfIn PDF document text
    • https://sanagustin.cl/files/vimesikuwisujinajivanukav.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/sevigavejepalewezigipizux.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/pusawexosuwiratotogunegug.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210926175910.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8d26219887f0ae70c8976c578d7f4b73/fexorabuditikaruken.pdfIn PDF document text
    • http://offerparts.com/upload/files/7840399310.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/ramudubiw.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/88850348447.pdfIn PDF document text
    • http://underbutter.cz/download/foto/19856809094.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/24212293068.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/44530664391.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_off0000aed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED9 10536 bytes
SHA-256: 03efdb63fee4b055524dc3496ad2449f7dd01710d5de905cd6a13f0d5f05c16c
font_01_sfnt_off0000c6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DC 16944 bytes
SHA-256: 109e9b35804cb036e178b7381a3eee431a7f5dc40c94b4ad8dcc7e547e475b2d
font_02_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1