Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ccbe02d72d82d43…

MALICIOUS

PDF

73.6 KB Created: 2021-09-02 21:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c91b609eeb6148eb474a4af88cb66ef SHA-1: 781d201455a286045276e4865099d5c0ae26a5cc SHA-256: 3ccbe02d72d82d43adaad6607e6b0bb0fc9b13668a9dbfce1aa47a7e7c8d6f47
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to obscure the true destination or spread malicious links across multiple sites. The presence of multiple PDF links and distinct hosts further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://tranhtreo.com/images/ckeditor/files/77590308480.pdf In PDF document text
    • http://livestocktool.com/d/files/xuminuraguxafonozofapu.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607886f077702---bozufaragitiduzijobepo.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/notalofizabogolopar.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/regezuj.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/13562877430.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/fusiguparojuluva.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/xupajarim.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/r34nbpn12ajhu025kv3kti1nih/86662606137.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a61244eccedf5590e950ee02dce93628/fipunijupakame.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/36577647143.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1843ad84ab---fajexuzotatim.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/jalapudodagud.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a419fb82437---24420919402.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/wuduvufulobenojajazozix.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/34023201675.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/relufiwikuledubid.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/bc941412775ef242f304f5c3a70b7d47/wupubufi.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a6b8eb020549562180c17b94c02dec85/tokajabigixifor.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/pixuxuwip.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/gugor.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083dbdacf0f6---89885236841.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/26949830237.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160863ff5912b5---7243520497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=meniere%27s+disease+treatment+guidelines+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_off0000bb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB79 17152 bytes
SHA-256: 2029cbfd2f5043e435cdafc60ff433a577511fc7db5a24f6dba67393d51286dc
font_01_sfnt_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 10848 bytes
SHA-256: 3b2682c2f20919dd277485185937e62bd5721a1be09551106bd717fc22b82fae
font_02_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1