Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ba239e3836daf4…

MALICIOUS

PDF

93.4 KB Created: 2021-07-13 22:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9e42494d5919bc39f83570dffe50e024 SHA-1: 1f868918f097bedf041787b764c4591af08ffc92 SHA-256: 19ba239e3836daf418e16d2e46413199a02fa6d5f84e2a644a08fe4ebfd105d2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. The document's structure and the presence of multiple external links indicate a link farm or phishing lure, likely intended to exploit users via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://stdtekstil.com/upload/ckfinder/files/vekilevefidomizej.pdf In PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26231423d8---45981790756.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160eca4e45d383---tunizevukama.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/44797254286.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f7a377952---pisosazetigudumiva.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8d22c25f612a1e04dc77bea4babe4f6c/85340776697.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee004aed22---81011196939.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816e2e7bb09---52446257925.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/75507c3d4f7a213772e7fd3af5777c94/jerovag.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/935olh2dh52rt6pq4idj0s4od1/69657453551.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/46b0dd5899614161d2667322dde31dd5/23025216453.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160cac01a19e63---febuxilejopifepubapi.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a866b8ad8c0---62316684933.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ua0pic46h36v31hg0gmo9h1762/84959477922.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a48bd532321---mevadefoferexefazeg.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/xuzuvedefapizuwijomaduv.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0393f4f80fac6dd9b3528d27db927a69/67197266905.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb2e792a0a---83879316367.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/jakepajiwomefote.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ae8c193a---wuwuwusiliso.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/6811b29747127743f19571b49d265169/81730114571.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a90251317---51818421310.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a780dc07a23---molife.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1a8864d52---14930233840.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5541c5f88f---fidujunasedivodomog.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/54661041196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pokeflute+cheat+code+fire+redPDF 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_off00010c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C16 16812 bytes
SHA-256: a1ddf3dcf18015b81c838bb9f4ec027fc6fabf1a6a0b6a933ce0e6a5af583e81
font_01_sfnt_off000137fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15013 10496 bytes
SHA-256: b6a4fb23d48613759311fc01e460857ee4fa831c2989884951bfe37a4eeb5909

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