Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca12cfbaea1c4612…

MALICIOUS

PDF

98.5 KB Created: 2021-08-20 02:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32af40908a259977004b57585334ac05 SHA-1: 969aacffdff4332832f3a229281a8cfbbf9befc4 SHA-256: ca12cfbaea1c46121b412ab48d9fda7bb664afd730df3df4d8c7a41805ab68dc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://huntic.ru/uplcv?utm_term=piaget%27s+theory+of+cognitive+development.+educational+psychology+interactive PDF link annotation
    • http://moscowfashion.net/content/xuploadimages/file/pujopuzesesepepatulofobat.pdfIn PDF document text
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/bibuwenigamofazuwuki.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160791e4b3dbd4---56531243267.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/tanagelovejuvoluvosejipa.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/zunefadifezele.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/gemegolotigu.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/6176988485.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/02fk60gqc6evck53v307evdc3k/71192003633.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/4l566f33oooimk97rp4gne6p4e/10849703592.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/o48cig60id55iudod7g2enacrh/33522790211.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/vegejudodobafomir.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3243ac570---66806710050.pdfIn PDF document text
    • https://magatek.com/documents/file/77223919239.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/409ni4cn2spfivmv0clpoo6um2/viwaviwavede.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071bab14a2ae---zuzazasurepawalerave.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/69568272799.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/fatabidarulodewudogufime.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/51422409798.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1823db1e4---kutirakapikudogozar.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8967ab668---xanasaverimamesa.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aefcb4c4583---31910790286.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/zesuxasat.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/53677745255.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd862f906---basosudabesonazeravo.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/c8g7ms21ddr6irbpeoi9augme3/zajenotufixaroraviwi.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_off00011b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3D 11448 bytes
SHA-256: 8595d37c0da77ffe2e0a560c43eae181ddde367a7e83cab453d7440560c229d4
font_01_sfnt_off0001360e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E20 17264 bytes
SHA-256: fe1a77a3642260a8ab64ee70462284c30a234285fb583f6c9e053b8fa8e777d3

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