Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3b5538a7e2e175…

MALICIOUS

PDF

85.5 KB Created: 2021-08-17 02:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ad8917c2da90bf278c05e4f2d3efcb3b SHA-1: 3f0c61f95f010d7844134cc40e65007a941b447f SHA-256: 9f3b5538a7e2e175e3b411f798ed1f5570982cbf6d1f1be6d43ea671870c191a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c4ddcad3b178598f3d046730aab1cf92/wezopifoxirojaji.pdf In PDF document text
    • https://proxus.nl/file/35788186158.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/81016538319.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/punilume.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/1911274882996141319d92b093b2d9d1/71196148819.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/24253472882.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/vemetabikevovefomedenon.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ad97d4428c9---kimaru.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/lelug.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/visavibafegekemetane.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f362c7514---gogiwe.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083950bbe82f---gilul.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/49072414540.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/83406560358.pdfIn PDF document text
    • https://rosycaffe.com/file/81757627221.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1610998af0f43f---lujegagexezivapupif.pdfIn PDF document text
    • http://ahchala.com/img/file/bolanujixu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6454dd3f75912f3d280759fbd5dcd938/xokiwulisakowefobisu.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/u2n8d4hfvotglg08v6q76isbt0/47661832085.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/zenesakagojufokakebelaxe.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/81305738126.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/25874861415.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bs019sqim7s3m4nbjlrnbqv65k/90445547814.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2a8fb84fd7f8656a492a6f026d800a96/41990907291.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/84276555108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=directv+genie+hr54-700+manualPDF 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_off0000eabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 16900 bytes
SHA-256: 8fa1386c637b5ba85ad85b3f56767c495d1ebf7e8a4da7bb13b24b7e61c4aa5e
font_01_sfnt_off000116e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF8 10972 bytes
SHA-256: f41f2b037c15913d7d300cecbcbb9a58aebfc1e7434b2a162e43c58e1b79bc40

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