Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16c0fb5695eb057…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 14:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e00db3d2faf2949932f5117479e96fca SHA-1: d38857f9b2989761f8b964f1c741f70f594a7e18 SHA-256: d16c0fb5695eb0571d60231b87b52fb505aba92181058dbbf1960a9076c7e1c0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.hmgfinance.com/ckfinder/userfiles/files/90992287953.pdf In PDF document text
    • https://ehlibeytalimleri.com/resimler/files/37235981356.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/3d97e92b59b55a854aa04b01e0df7207/26818608771.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/jaliki.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/lipisojagoxuresanibom.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f27e70f351---vufegipimezowojemis.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/64733617066.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/nolafekaj.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/43326831296.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/sivukov.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/pojuxonufijuxomoxa.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/nibidujovurifowotesemogo.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/98354675694.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/5872698154.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161342b55dfeb5---24306939275.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/79777336083.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/87056137071.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d96b0f1e75b997cdc0470b131b766360/21861251410.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/buzegadolejibajo.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/lebopuxab.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/39930690695.pdfIn PDF document text
    • http://www.douggoodkin.com/admin/ckfinder/userfiles/files/laxenipuwonex.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/porefekefepe.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/gikegifutad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hootsuite+report+2019+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_off0000d162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD162 10732 bytes
SHA-256: b901dfe8bf6b7fe7b3f3cec5a41684bc2d1a19b89e0048493f55891000606c30
font_01_sfnt_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 18084 bytes
SHA-256: 0c4bdec9241c933bec57258759fc2c72d88f8da4a614a509f7147fd0f5621cb5