Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d16ad648b251aa…

MALICIOUS

PDF

99.8 KB Created: 2021-08-03 04:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d11c8fa8159368d8232eb840ce69d109 SHA-1: 630b94e48d5b9d1df7e9be2ea19d33b7630055e4 SHA-256: 51d16ad648b251aa15e5dc3a569fe26d2377b2228faf78b5a8dd4496b6162f37
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c2fd535d84975fdf0ac5260404dc2888/vitosokusavonofurasizi.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f49cc48b1a7---fudedupotidapuniwifigabok.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/86318521066.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/napumi.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9909ec5a4---85413795125.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/52132364040.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/8bd871d87e67f50ac0758436c9ba6ec9/52504465058.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/qe0ff1e9r5hu8fulub9holmc8d/41784408716.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c4d184e80---mijonelimu.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/6434123090.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/zebovexek.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc1a080d7---69873914999.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/20012372869.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/b0g908ao0lk0k75nrvrt4kfskp/xitonubosibex.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/10b3ec4e752b69cdcca7eb6a1ae729cd/gexikujovivizez.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/kikof.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/titoxezi.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3080d5b91---zirununamadamokulaforamo.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/sqmt5kt7l6lnl4vc4a8i1eprp3/kusojoburoge.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/vajoguz.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf5cf425d3---netidazezewuxeli.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/53150910024.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/72510353660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=teledyne+meridian+gyro+compass+manualPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f15a4a0d6442182b8e9b358320e2238d/10566170573.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_off00011f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F87 10936 bytes
SHA-256: cb1b344b65d5fdcf1a9ae2b3b3b6a2f2c599c265f6fa3e83b49b6c581507021f
font_01_sfnt_off00013897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13897 18232 bytes
SHA-256: a7c60ea7d94ff99eec727eb8218b1c955c39e3e5c4405d7187a0743bbf053321
font_02_sfnt_off000168a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1