Malicious PDF — malware analysis report

Static analysis result for SHA-256 558a28ea21a67450…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 22:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c190dbd0a552bcfe35566755fc2603fb SHA-1: bb7c2c4e85e31676150ca66a95ea4ed7bc148344 SHA-256: 558a28ea21a67450d83ddbdb4f7df50502fe05d52b084f19b0096b9f04b32cdf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content 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 0.9987

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://archinfo.ru/uploads/file/pidiwazojuzimobarinuso.pdf In PDF document text
    • http://trubaopt.ru/content/file/52705050170.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/35027342495.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/pisedinoneru.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/5a92bba5e551d3ee91ad1180f45cbb5f/20571836578.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///84643331115.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7j1oj4uj5nvq5bh602uv7ffke1/voririnenejesizavedoba.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/55192735822.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/39708343966.pdfIn PDF document text
    • http://afro-safari.com/upload/files/73975680968.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/19660526581.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/46392204619.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/baff69df295082344a77cc3ca0c2e6c0/bufitukitegikubi.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/2700672061.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6fa09d2d---zemaxone.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/fakutujomixefubo.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/dutilepawenewuxaluxuxug.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/30958886739.pdfIn PDF document text
    • http://fitviewer.biz/files/file/42745543136.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/lerujakerivuje.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b55d0594cd2---92704171005.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/lapelowegevobarukewalos.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/968f01c5e16177a7d022878e3230df3b/84160048845.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1e1623ea---90593095549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ethics+and+international+businessPDF 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_off0000d757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD757 10688 bytes
SHA-256: f86d909b7204f38c7913250f012055a2378833f311bd165490b8b88f7e9e3bca
font_01_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 17728 bytes
SHA-256: bcd37d10112a16a6b99450e3fd34e2b058abc5c214b7d458b7e2a6016d957be6
font_02_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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