Malicious PDF — malware analysis report

Static analysis result for SHA-256 699c57a059f00f90…

MALICIOUS

PDF

84.7 KB Created: 2021-08-21 04:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c972aec15c1331d0e07915944dc445d5 SHA-1: 3f8de6de41ae439213a9d4b47d4055871e151bc0 SHA-256: 699c57a059f00f90bbfd0558571d18fe28454edc4ba579c1bdf8c0cb9a1021ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with known phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc1860d823---31562224335.pdf In PDF document text
    • https://istanajp.com/contents/files/74658073241.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68dd62f922---viporadelotipenazanu.pdfIn PDF document text
    • https://egf.tw/test2/images/file/letuvovivefepuki.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16093b4f67b8a8---pakutonixomuwofof.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/b1d453ee0d4dd8896e6b787948c3fe88/vopilinomusadokemu.pdfIn PDF document text
    • http://belloverde.net/emailer/file/59220066635.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/doroxelufapeganevafusoxi.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/tuzavetotebotafosesa.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/kirile.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6f49c16bcbd48216be4df0369f9b5410/70717574277.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/84024718780.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608679b215807---mudeve.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a389bd36565---29341344291.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777124dfa25---figuwuduxoku.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/76834350188.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/85326359980.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081d6f666952---9061294595.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/vlkascck470edoftgsdu1erfpg/paxuzikusijumuvewediveki.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/peruro.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d06ec71de56---31001895854.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/70846774452.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/jubovikulisudupapem.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/10535886332.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/jovamukevikujifowifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=punjab+national+bank+calendar+2021+pdf+downloadPDF 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_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 16236 bytes
SHA-256: 197945cb9d0e7d728386c4383d3c0952b6a5a50cb7fa4798c9fb8d72b006d5d5
font_01_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 11288 bytes
SHA-256: 45cb02f5427b93d63056f28efe3eba579318edc804b5d54ea3b558b41eb71e1b