Malicious PDF — malware analysis report

Static analysis result for SHA-256 8508607c96675ce5…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 02:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6657022771b3d4807c6be978d3b57986 SHA-1: 665edfa1b47936d7541a67da0cba1cdc0c90748a SHA-256: 8508607c96675ce5f86aa8cd4c8972b53867af28ae957834112fbf8bd3fde8e8
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a link farm pointing to other PDFs hosted on compromised websites. The presence of a 'Password-protected archive handoff' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4efd681bda19f977c72a921f48313ecb/rusotafegosedinunufasodet.pdf In PDF document text
    • http://colorfusion.us/admin/images/file/24494569336.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/27190982498.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/suzipazijipejemojeropov.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/73640307281.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/46316050585.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134167e98f04---99878089970.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/bojugerub.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f131442b3a36e5a479900aa950a266bf/18053467972.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/sululimosoliw.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/luwumebetafujibizokede.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210911174515.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/zololotudejuxiligumu.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/duvewegawisarube.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/92424043821.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/38056266628.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/firubosufuj.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/juweruvivoxiromurar.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210907194449_lpoit3.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/weduv.pdfIn PDF document text
    • http://chinalabware.es/d/files/nulelokasubedaraxurowew.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tugogavokekitudo.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/17539157553.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9367e106f---nimarujojiradaxed.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/29455578707.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/9094068094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=messenger+fingerprint+lock+androidPDF 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_off0000dc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7E 16648 bytes
SHA-256: 4d84810d28014c086a123ef1ff9c0e86715b65fa8580e66a03820d90056ba607
font_01_sfnt_off000107bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 10880 bytes
SHA-256: c3728cfc67ba63c210bb1efb43cf89524869ef05b84d023be70878f35d0efa03
font_02_sfnt_off000120d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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