Malicious PDF — malware analysis report

Static analysis result for SHA-256 088d99826d3ceb97…

MALICIOUS

PDF

70.0 KB Created: 2021-09-10 07:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e457ad17d3bfc7a77f3781f3a7fb8e8 SHA-1: db10e9400c94b9b8c98a59f7ecfd4f4408be9d0a SHA-256: 088d99826d3ceb97094d05637ff4522bdc2c13188ef14ce410b00edb4323d1f5
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These URLs are designed to lure victims, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://queure.ru/uplcv?utm_term=why+does+my+tablet+keep+turning+off PDF link annotation
    • https://muratay.nl/userfiles/file/38362157883.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137cd0515140---69869582498.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/weputedoturesaj.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/votif.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/bupuvodasugi.pdfIn PDF document text
    • http://kesifveotesi.com/files/nuwejogefotoradoxuvasava.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/dubuvumugivivuzovutug.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/17007296560.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/97524039434.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/vajoxojafagojavi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137747863677---tazenuwu.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/28089181249.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d2ebcca44---nokitapapefemev.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa6e8d53a5---15636031510.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/72167130368.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/gifovosimowurodeloniz.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/36027129920.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/10154365892.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/32709657239.pdfIn PDF document text
    • https://masukpt2.com/contents/files/40600940302.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/18229430060.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/vivomazaviraturuga.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_off0000b1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA06 15120 bytes
SHA-256: 5740598b393be35a8a335e0abe732b70c079e9a18dee92b69c17516dbad05f94
font_02_sfnt_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 11384 bytes
SHA-256: 17174061554fd52a617ee20865a825a797b6a4918af7c692137e847206c891e7