Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e4a5a505fc18ee…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 23:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a7dc96e3159fdfd464ceb465959efc36 SHA-1: f3f63abb5982d47e8e6fc163c7cb40078e5f7bdf SHA-256: 36e4a5a505fc18ee42bf1d3e1f8e88d34bbd2de5f685c652f8a6b00194f93deb
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as 'Pdf.Phishing.Trojan' and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58765005109.pdf In PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/bisifega.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210916084602.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/nisepanufagifunepixef.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/24756826771.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4034761a8259cbc66f217711c43218b7/75197599823.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/27241793807.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/jurotorabovirezemiko.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/tefudikexukuxiro.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/xetowewekuxexap.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/61555254172.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/87728247373.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/kegiwasezapaguwato.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/45678761453.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/fotiletovawup.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/75678774702.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/1hh87ibbp365e4qgcvpgf08n00/74340876658.pdfIn PDF document text
    • http://cabini.it/userfiles/files/damobodeseji.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/vasapuvukajitesunen.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/36098053608.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/41935869109.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/loruxasuva.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/3v5me42kn25jvh3tlmt95hfmi0/burominumupoj.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/pawimosulugulevagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=motorola+recovery+no+commandPDF 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_off0000d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 10444 bytes
SHA-256: c9402274fbdb96337f6c313b84cf80b94b337580929eb0f5665d26a0c663b2a1
font_02_sfnt_off00010767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 18636 bytes
SHA-256: d197257cf5f50eb618a7f7827764bca3b90ca99864d94bc4199fa8fc7b41df75