Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d898374c64d72d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 11:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37a601132ec6da82f4e1ad0fc59a72a6 SHA-1: 1fac104d710b3c68ff4b8fdeb317fc801cf479e4 SHA-256: d1d898374c64d72d17277d99c5ec3122b1c1e104ae6bf22007e8d697904b1449
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous disposable and compromised hosting domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://garglob.ru/uplcv?utm_term=phone+cache+clear PDF link annotation
    • http://asbu.net/uploads/FCK_files/file/71886643632.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/57592007848.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131596d74b0a---vizoxikip.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/netamonedumovubonu.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/58028238533.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613012609f02a---setowezevur.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/6228208885.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/88955855651.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/21579908810.pdfIn PDF document text
    • http://mitrasuksesku.com/userfiles/file/34081470956.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/18061914488.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161350de41d822---gedudalapufipase.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/94625194922.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021090311370973499.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/mituzederexopilile.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/mipijazozugakukubuninaveb.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/gibarevifa.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613867f11ab81---43545803969.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/76773975156.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/61898878464.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/37929785063.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/gunibiposefobit.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/vasudonejibofufazijide.pdfIn PDF document text
    • 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_off0000d9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AF 17300 bytes
SHA-256: 84a9554b542cc25bbd46350e3501b19e1efe744a97496ab9a17fee2e0ddba488
font_01_sfnt_off00010626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3C 9968 bytes
SHA-256: 86a8efc7abb95f57824066ac2bab175dae8197ddbf7399c1ef9adf9782fe29fe

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