Malicious PDF — malware analysis report

Static analysis result for SHA-256 6106a2aeb6ea27d3…

MALICIOUS

PDF

93.1 KB Created: 2021-07-21 07:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3fc081018aa2e290d77856f9b291c2b3 SHA-1: dca25d9f2d29ca4f910d6917c5b470f548a14238 SHA-256: 6106a2aeb6ea27d3065d4dc25e66ecc0bfa2ea78e9ee4d628b400fca1ca15a91
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, and contains multiple heuristics indicating it is a link farm. The 'SE_REMOTE_SUPPORT_LURE' heuristic suggests the document's content is designed to trick the user into installing or connecting to a remote-support tool. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://c-six.it/userfiles/files/59553547570.pdf In PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a70bc1a9626---71676983152.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84873684348.pdfIn PDF document text
    • https://songuryazilim.com/calisma2/files/uploads/xaxinigow.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/mifapafoladazinunozef.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf317419a---71310286337.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607144295dc4d---34543317460.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/botuxamiloxa.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/diwetemakotubek.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/39150654040.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/40158308075.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/jujiwudopegur.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdac6298c7---niregawojux.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/881bbd7299ff6ae31be5f7e0abd4c322/33043560251.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/8278874533.pdfIn PDF document text
    • http://arslanemlak.com/E/file/28937926936.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/76799964236.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/jn5r2bcm5qummv539lh0p4jl85/13343096672.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3bdf7ef218568a13276c14338c201cf/maduxusamiwemeduwoneziki.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160745761b5390---rajidawomabifagira.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/86882883005.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa785c2d06b---viwotisuzizumofubek.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/40045268130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=insurance+advisor+interview+questions+and+answersPDF 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_off000107c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 17636 bytes
SHA-256: aa821a3da4a716954fca90f4dcc473d1404a030ac9ab9a5c2a2e3943b4418e6e
font_01_sfnt_off00013637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13637 10664 bytes
SHA-256: 840f32af07a4217fe7ac0009dd7d7b6071dfb987f41dfd4acc6825c78db7e77e
font_02_sfnt_off00014ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1