Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c074b8f29212d3d…

MALICIOUS

PDF

127.5 KB Created: 2021-09-02 12:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18cf13a555b243c559c0b58ad1b208b3 SHA-1: 4cf88238e7e469d719ca0cd103d8db949483411e SHA-256: 4c074b8f29212d3de08df39c02bed8c0c6810099439a368bcce005dc63ab4623
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage, suggesting an attempt to lure users to potentially harmful content. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1610c9c220fdd6---33994153099.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/oja77qb1dogi61l05rp5jo4t57/12594569307.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/88589114789.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/javilipuzawolizulixo.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/domadofel.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/dokebunabobufatoregazole.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/begesaruruvinoseferagemas.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/43702380595.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160783145dc9bd---binunalenorugep.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087040e9553b---wekil.pdfIn PDF document text
    • http://whatdwellswithin.com/file/91214651703.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/jorazuwakuwevenuzezor.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/76079725667.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/ziwozatu.pdfIn PDF document text
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/88881346218.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202108230955337508.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/debuju.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b8b77c688447e13a542f0855c2fe94b4/zexubutonemitozerifatep.pdfIn PDF document text
    • https://mollis.rs//files/55800648177.pdfIn PDF document text
    • http://jonme.net/ckupload/files/womopivijekezemed.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/3ae20f49bdd23f8549de504db4dc562c/dajovujejigexivufizupo.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2b7c85346---zigiradukodimomasusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pathology+mcq+robbins+pdfPDF 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_off000183ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183AE 22668 bytes
SHA-256: 796d7e03697982b2adc9979919b06eecef5d17916ab8abdd9623dc01762d2886
font_01_sfnt_off0001be99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6B0 11336 bytes
SHA-256: 84f8645fe05f4b116f03f7a89bd5113ac04360ccf03eb21f84dfba1c6a20850d

Open this report in the interactive analyzer, or submit your own file for analysis.