Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd4e85796ac2943…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 07:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 56e2e802317e20c3ae1041e98d487048 SHA-1: 335a73e52ce76ed71fc0e809bf1a2c8940519fb4 SHA-256: bdd4e85796ac29439e49042dfd62ab95b64e4f9a95e584c1bafb1b1fea3277a6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://alltimescare.com/attachment/files/90213514516.pdf In PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/veliweromotisaga.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e69506f628---fukamunofut.pdfIn PDF document text
    • http://gsacademy.ge/uploads/files/90641236111.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/54931846711.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/bofurogi.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/jixagalelexenas.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/kamopafaxaseju.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3304c3b0a---kemanifibemilafibejaf.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161531a014411b---lokaril.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/pofarufirafilanufixuvot.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/89484512216.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/lulumigatijedala.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/2622856986.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/zemelo.pdfIn PDF document text
    • http://ruresept.ru/files/file/36122971636.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/giporurawiwilab.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d866982f4c---74941714970.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd62f3c178---kovidululusawop.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/93591017824.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/40086985016.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/wizuponulokifibevepiwu.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/11554506344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=game+digimon+android+apkPDF 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_off0000b1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A2 14956 bytes
SHA-256: c26eb26114fc17ccc6d5d08fcdd8f5133d7182987c0fe503296e7f18253fb1df
font_01_sfnt_off0000d7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 10556 bytes
SHA-256: b5c78fb27c96edac814849116af594f1d950e4dc153fe93605e89b40d3a5dd1a

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