Malicious PDF — malware analysis report

Static analysis result for SHA-256 42acfdb89a046a9b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 03:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de1875d2dfb2e19de9fabe743b4cd3b3 SHA-1: 09705f9a886973ba130a948f5919f4100b269d93 SHA-256: 42acfdb89a046a9b08d925d55d695aab78b48477a916789e56203fe4c395c661
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The presence of a 'MFA / one-time-code harvesting lure' heuristic suggests the document is designed to trick users into providing sensitive authentication information. The document also contains numerous links, many pointing to potentially compromised CMS upload directories or disposable hosting, which are likely used to host phishing pages or further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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
  • 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 https://bda.ch/ckfinder/userfiles/files/dugese.pdf In PDF document text
    • http://kolbiko.com/images/uploads/file/petesitunubepurofu.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/86202096807.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/1d4d56b626dfacfc337fb4cf1cbd35b1/ligomawukaridesita.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161408c70bf016---debegowewore.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/fobonarujuwenajupowuxo.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/kedajatagubijo.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/basapelogazibawutujapoda.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3c07333d7c6c9013c5f2cb029b7838bb/fokifigadigavadurewadimi.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/xexavub.pdfIn PDF document text
    • https://kopari.hu/files/file/benigofujalakane.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/15u5hgq4l3lsikt5115329gits/fisijubujodab.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/mabamejovudatilab.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/99230239610.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/80755198185.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/nomipanozozokazor.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9086a3ef8---78085022347.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/nezukavazijifud.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/81059155317.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/vodogawofos.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614216361da3e---pewenekevigux.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/gulomelepipipew.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/retemamajibagavelamusodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+hard+reset+moto+g5+plusPDF 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_off0000e09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09F 10956 bytes
SHA-256: a224d464d929d4de344beac6fad9a5d300fc0963c0266fafdd9f54736d3c8ebe
font_01_sfnt_off0000f9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 18508 bytes
SHA-256: edd8c88948c1cfe6a4845cab5faa2997d7abac554c77110a99b9bacc86b2c8bc

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