Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc076defb1812f7…

MALICIOUS

PDF

85.9 KB Created: 2021-10-10 23:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b35d688c1bfb08a1accdb2092dc03fd6 SHA-1: 9ba290ae8792c959ff4995356c7468e905e6cf85 SHA-256: 1dc076defb1812f72d6758f44df7493cfbcf7f04e977805736617c575ca09807
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating it's a phishing trojan. It contains embedded JavaScript, which is likely used to initiate malicious actions, such as redirecting the user to external URLs. The PDF also functions as a link farm, pointing to numerous domains, some of which are hosted on compromised CMS upload storage, increasing the likelihood of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sochisushi.nl/survey/userfiles/files/dupolanejapugujevixexe.pdf In PDF document text
    • http://wawa757.com/uploads/files/rizegoregazixevamol.pdfIn PDF document text
    • http://vuason.vn/upload/files/wufopenijogiwitefifikija.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec7d62ae22---kagejovoge.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/vobazexurimas.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/jabilivisem.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/94022809963.pdfIn PDF document text
    • https://5uempat.com/contents/files/segezezemifuxofigugoj.pdfIn PDF document text
    • https://kvzriu.org/images/file/50698359281.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/60025523334.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/94493922448.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/zubonanut.pdfIn PDF document text
    • http://stylekd.ru/files/95092858651.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/gowiba.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/ditujudugukiv.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/65871907683.pdfIn PDF document text
    • http://wernitznigg.at/files/37871357384.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16151ef03b4f37---83930528772.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/zelubukadelaxetitanope.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/nudufadanosudoseti.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/fefonijeperesijebovumupi.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/5df5ec6367adb84bfc165eaee7c9ba5f/xibozenipipax.pdfIn PDF document text
    • https://073741256.com/uploads/files/202110042114218335.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161321b3bcb193---jininiranigopoj.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/1320139921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pinched+nerve+in+right+legPDF 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_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 18228 bytes
SHA-256: 6d9ef332266274b79034de46a5be89b091ab5487ca8d99c2f181cce18eb1c7bd
font_01_sfnt_off00011b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001336b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336B 10268 bytes
SHA-256: 9e8b24096510f013ce6ed83c12dfc6e70d9618a52bd22b6d3d039fce5f91b282

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