Malicious PDF — malware analysis report

Static analysis result for SHA-256 92983e8c1575bfea…

MALICIOUS

PDF

71.4 KB Created: 2021-09-24 22:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a296b47c0865329fc871e8573b50dd74 SHA-1: 3618a3e1ff7a62f9a9c459204829756593083e7a SHA-256: 92983e8c1575bfea4de64c20de083bd1b8bb3e9de40dbc3cd82636f308e100a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, forming a link farm. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://edex.co/userfiles/files/mososuk.pdf In PDF document text
    • http://happyhanool.com/ckupload/files/xawozapezimovebamumali.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/53371175924.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4fbbe8574dd7a2aff50f0cdf1fe89a59/jemokilon.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/54448158375.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/sekubigisonijefaruwen.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/88179820842.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/8a92dae34fd45f7512abfa01b8172483/94300194544.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/wabedibutujit.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/12239099082.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/vaxekedapubodajanaf.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/zakudizuz.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/kii0eo31ar7f0n2fbp6a4bglfh/16004461058.pdfIn PDF document text
    • https://pixel.bg/img/file/wutip.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/padafoduruxefuxuna.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/28385722738.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/24923359124.pdfIn PDF document text
    • http://attlas.center/userfiles/file/47092503593.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/nabesinax.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145af6d060e4---78153659981.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/18444513665.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/53685323077.pdfIn PDF document text
    • http://podarox.ru/public/files/479463966.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/1066019626.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/70048625816.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/99336543576.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/nobuninabenuloburan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=leo+tv+apkPDF 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_off0000b669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB669 17084 bytes
SHA-256: 603f8cf82cde44c5a3f3c676197f8c45d6847ec2ba0662f2d777157649304252
font_01_sfnt_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 9852 bytes
SHA-256: 01e8855de4581313b6fc75adb2cf454205149d1408f25d0239183766b4cc4002