Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f15de8bb71320ad…

MALICIOUS

PDF

92.8 KB Created: 2021-07-28 08:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4c9179b8a2f0a1b6d6679a4c534e4ad5 SHA-1: 8707bb30b5d4cb69dd83a78e2a530eb0570dc54d SHA-256: 3f15de8bb71320ad2f7bc7700d35aa97ed3d5b21aa421bdeab226feef344081a
236 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It exhibits characteristics of a phishing lure, specifically for payment redirection or MFA harvesting, aiming to steal financial details or session tokens. The document contains numerous links to potentially compromised or disposable hosting sites, suggesting a broad phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://meruzhankhachatryan.com/app/webroot/files/file/rejufaraxinaxozubi.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/zovupefexobiponidola.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f93909959---vojate.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/xavorowunos.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f0f880f56---minefanatilolozita.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f861495b53---lusebul.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/6850916471.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba3f589b5---90047603727.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/62839549532.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609474d941937---sotiluporamirugovuvoli.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/54491764426.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160adb208060a7---tomupej.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab404fcb4a8---vigumaxixenolub.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f5952a38209---71174197997.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b987849a241fccc1bf86009e448f5c3a/nigofosomupe.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/dijoxalebigimipuxozepe.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bba59275478---9436833037.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/shf2ue8el5kofjqvt632uqbqm3/44620312340.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/d22cebe8e861e90ab056cbfe3bc60dc4/10315169161.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/17259125399.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/61899c41d00e033285b1fc66a6e40428/71685684004.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/87703256277.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075af58cfcef---35229540561.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d8069a70---56596481255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=why+won%27t+venmo+let+me+log+inPDF 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_off000106a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A6 17956 bytes
SHA-256: cb21d2b503679a6fbccbb8c6069f37a391f91c3abcc4c060706804e16b43dac6
font_01_sfnt_off00013608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13608 10420 bytes
SHA-256: 15cbcddba5a6e48b0b5f3b57215d74364caf73b5c953b853f864fcb178179b88
font_02_sfnt_off00014d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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