Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa704bf4ec43a1e…

MALICIOUS

PDF

71.5 KB Created: 2021-09-02 12:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40e69f5fbb53b9cdf4f5ef94009ec44c SHA-1: e8e1537012993da427cb34d8e9a7d6f3802cc6c6 SHA-256: 6aa704bf4ec43a1efad6c6c33496e8ae88d4876332150cdae7d5676bd8f5f5c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The primary goal appears to be luring victims to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kosamebinunawumeti.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/zakomog.pdfIn PDF document text
    • https://wasael.com/userfiles/file/20712768290.pdfIn PDF document text
    • http://whippets-au.com/clients/7/7f/7f5032e15db821a993a8146895416847/File/degejedomi.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74ec92d3f9---94932200441.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce69385357f9a78a2f6958f160df28f6/dukaxivevuzoruwivozutuven.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/88017192614.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/dekubejovonoxadadegeweg.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qt3c7or8b7f3vsfeqrg6m4g1t1/1019832969.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/modimiposuribasutowu.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160990efa1d923---ninitanixak.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/26fa75682ae4054508cbb5d0940b0c5b/zezamekesokijade.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082465b5d6c3---dulinig.pdfIn PDF document text
    • http://kme-kme.cz/files/file/vofib.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa56ecae6c---82505094386.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a0c9c5b3a---89370074871.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/wafemu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08fa372183---xezekizizanorupusotefe.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/rodowosuvofimusoke.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/pasujunasumitugukixulopej.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/zubarituzomi.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/lawifevidosedulizawuzev.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/xizumegifaxigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=difficult+homophones+worksheetPDF 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_off0000b818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB818 15436 bytes
SHA-256: 6168fe60490739e703c527e7cb983f8a12c42d07bb5c0494601e5329186f4542
font_01_sfnt_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 10860 bytes
SHA-256: c9059ee1ea7f7e735be02f94d4890e19bb5a7862abe3fee50ba18244705d9896

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