Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7cc4c1a59bd56a…

MALICIOUS

PDF

116.4 KB Created: 2021-08-08 00:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ed9269e56a4d083e61d604af8b54ed0 SHA-1: d8224c572990be091cf391a3e47652625ab02b43 SHA-256: 8a7cc4c1a59bd56a0fd6bb6b9566e4f89b0ec701dfa1cb6c45ec6be5c26d7074
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to compromised CMS upload storage, suggesting it's designed to host or redirect to malicious content. The presence of embedded JavaScript indicates an attempt to execute code, likely for downloading further payloads or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oniceh.ru/uplcv?utm_term=is+it+possible+to+restore+deleted+messenger+messages PDF link annotation
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/4hgf5u0c042kk8889bktuep7um/68622924587.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a67c5677f2948f106e8c92f53e2eb9ad/75166683758.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ea97df5b5f2b141573b36a569d006313/vuvijagaxabokatij.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/fec684051e3ca49e8f45d238684e8147/mipexuwigunuzidozami.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/popuzemuwufeke.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54794839470.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/mujegiropelulimu.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/50b61a2e0bc0dc0aa49a855f7468db81/43437892815.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/surujegibev.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0fc84065d---66764563789.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/kuxujalosemiri.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/92f35235d23e10d9797da7305ccecf14/96203339978.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/80436912358.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/fofefidufegu.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/tfgnm2c7covl43sgq2kh52d27r/21048610574.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/c973d6d045bc85cf9bcdd9fd0af8b796/91615506480.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec13d5e7fa---lujasedo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2036211c8---zopepesigesupinafo.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/20588486091.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/jetukunivuva.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17584058579.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b245742aaaff5768b22e48988140f0a4/8306621860.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071d496c17b2---26734767319.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/14285991856.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_off000162bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162BF 10824 bytes
SHA-256: 2dd311c4e577f46111b2c7c90e31e43263418b4a7c66be7aef4e72ea62206344
font_01_sfnt_off00017b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B34 18428 bytes
SHA-256: fc59e8bcf6e1cd014d606519b32ffd0673a504cf3bef50e2951ee7e52f2ea181
font_02_sfnt_off0001ab7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1