Malicious PDF — malware analysis report

Static analysis result for SHA-256 39697f83be371fbf…

MALICIOUS

PDF

74.8 KB Created: 2021-09-22 11:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d5926cbd97bb08d67bacf501c802777 SHA-1: 97090e9c6c920507f94728f2ddcfcbc08fb328ae SHA-256: 39697f83be371fbf80b5e4a17b976f5ebd6405134746349746b44ce9f543b73a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential SEO-based lure, attempting to trick users searching for specific software into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=flight+simulator+x+android+apk PDF link annotation
    • https://doxity.ro/ckfinder/userfiles/files/53277782306.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/putup.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613380944b8cd---jukorobugifegekuguluxa.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/80501555873.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/wezofurexaw.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/rufezovovebitomiwe.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed9368ea65---doxefebesu.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/21567004215.pdfIn PDF document text
    • http://hamayeshniroo.com/shop/file/komajomukuniwobej.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/mipabaf.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/43422989807.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/27654374688.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/xezuvopukuwujowe.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/rifiwakipimibigumirige.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/fuluvamav.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/lizusuvo.pdfIn PDF document text
    • http://inphilong.com/upload/files/3588770482.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/tajedananis.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/jenaderub.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/kalogimowogozuka.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/kuzot.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/futegazevuxikagamiruso.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/rixojukunurimuvenuwulilan.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/ke2lt4ir0hgqb3g8043rfikth88sg162/28098760049.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/88209457110.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_off0000be77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE77 10976 bytes
SHA-256: aa65689dab8845376270a381ebc858751de789f67bc2481087d9f2ee5df9534e
font_01_sfnt_off0000d787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 17644 bytes
SHA-256: 43e4960e30e2eb096421946c75e6ed0c54ace87e56927b7ffaca30a8afe5549a