Malicious PDF — malware analysis report

Static analysis result for SHA-256 740910a3a99991cc…

MALICIOUS

PDF

85.4 KB Created: 2021-08-20 11:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c4ee59abd2329ba524d3492a8a3671f0 SHA-1: b16e9658c85d33eff63e2b74e342f34c8f4a8b23 SHA-256: 740910a3a99991cc88141f13b6fb45bdf7c39b5bedde8bce470c42f9d60c277e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports the phishing and malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://csc0532.com/userfiles/file/20210802131521_llxpkl.pdf In PDF document text
    • https://gelblighting.com/userfiles/files/78753556032.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16083aaeae422f---zonifoxalavolobev.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/lebolifaxobelu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/lunuwude.pdfIn PDF document text
    • https://kristinanamaste.eu/files/16471474406.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/24496363470.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/408ff6fd24c3ffb0d22637b576a11ab5/wevuzaxewixemoga.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/416828c9de811be7c1448502d824d763/84272795047.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5804aba75f641835f13cc40c16e70882/dewedozipogapinesedere.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160979244dde34---kutenozibofigazov.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/kcs0ruimvtohpfibi06f39dcs8/mabanunenetuzeputitoxez.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/21823017266.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/wotudotadatisokoxola.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/luvijejizasasi.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021080611512474.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607526dbb38e5---97138095449.pdfIn PDF document text
    • http://charlotteellisscholarship.com/clients/a/a5/a56794a54ce3a7e2a8fdc514f00cf952/File/9826629638.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/93646377228.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e34e7b601ca49a0d30c84eed3469bf89/zexazaxanitufawugojufi.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/88743221308.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/19371024964.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/7t2bimubbmh5rrs1d8eailosl7/sizajebu.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/78581464389.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16275798241392115530.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160813598e91c3---gebemoma.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebd235f161---97828034109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+the+password+of+payslip+in+hamraaz+appPDF 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_off0000e55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55A 18064 bytes
SHA-256: a293f6134339091fa60defe5baa9b4a4503e3a667fda1de46766f4ab727f5c14
font_01_sfnt_off000114ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 11016 bytes
SHA-256: b55af519063f9f5b2d985bae69118373f1c3e0afc163e5a8f50afaf6aa127ec3
font_02_sfnt_off00012e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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