Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc2a0ee153c7951…

MALICIOUS

PDF

86.8 KB Created: 2021-09-20 16:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 365f04b2a167761226ee5b64357f3800 SHA-1: a67c7a4b60b971eda3f7ddc612925f492794dce0 SHA-256: bdc2a0ee153c79510c3641f1bfc86bc2ca6142008fb81d141a523271149e0ab1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://laborke.ru/uplcv?utm_term=how+to+link+outlook+calendar+to+android+phone PDF link annotation
    • https://snowcat.pl/admin/ckfinder/userfiles/files/25428368603.pdfIn PDF document text
    • http://geotersrl.it/file/81825465823.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421a616d3b2---ziwiwepumezesifogepax.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/48862815693.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/daxapemoxizel.pdfIn PDF document text
    • http://aquatherm-graz.at/files/govalisitufababax.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613462e5d599c---22194511655.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/lugib.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/60327711812.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/daluwuzitorukuxugagowigo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/vvati8th3tu4f58vn364hindfe/tapevuxamuki.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf4a3dbbf---10714660998.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/55208e5b544c7ccdd1130c3edd99415f/16763277126.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9c25abe5027bc19ffbabfe572667d77c/vereneketuxadenuruj.pdfIn PDF document text
    • https://aaaxxion.info/images/file/47634032386.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/49256900816.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/87526792510.pdfIn PDF document text
    • http://ned.ru/uploads/files/16675210318.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/45292617182.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16144308c938fd---zopowam.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/selunoxolikexo.pdfIn PDF document text
    • http://netart.hu/userfiles/file/59217082712.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/gekaluzamitoru.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/jemejawizexi.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/babab.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/zesoborudusiwadamobide.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/ratuvasuvitetezofubetimis.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_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 10712 bytes
SHA-256: a5edbb23d05bf47f99808f0522e82f18ebdc972ef97876a06f52a91ebcb6719f
font_02_sfnt_off00011ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE7 17772 bytes
SHA-256: 1c4ccd3571b12f2b788b44034769eefc93052a52d5972a27e574804ecf1df527

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