Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d2f542c03b695d…

MALICIOUS

PDF

87.9 KB Created: 2021-09-03 13:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c9e1331690bf929a60e446befe70ce4 SHA-1: 047ca1043251ab37ce5438b434d327f77b967677 SHA-256: 15d2f542c03b695dba5054e05302564683592bdca90eaa4c0dca3602ce7c7b4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. This pattern is commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crewmak.ru/uplcv?utm_term=the+unearthly+laura+thalassa+pdf+espa%C3%B1ol PDF link annotation
    • http://generale-bureautique.fr/gdb/files/file/31439867013.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/mofunun.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/88055727872.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/gujonaginobaresumumu.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/94443022164.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/gafokakegidavunulum.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/14095465914.pdfIn PDF document text
    • http://scro.ru/pic/file/nutebatiku.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/pejitu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/50100814e5bd747e3d52a641c2e2b515/62579772603.pdfIn PDF document text
    • https://cecprint.com/images/file/67310664139.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ac08a323ae6b52eacec0b17070627562/kugekixajixap.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/kujud.pdfIn PDF document text
    • https://ancoraeducacion.com/images/levureneburosutanuson.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vusefana.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210826_155327.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/92429105978.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/wudoziramogaraxoda.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121abea5e4de---91570114353.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c9025332e55d45f9a096f30ba65c44bd/pozukiko.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/7vr1mnlf776crvnmif9nu7uop6/dovupefar.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/26728222106.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/2189483020.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/53771077446.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/2675344127.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/21012275455.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_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 10888 bytes
SHA-256: 32c53a87912ef78877abbfc4ae92e97c39df64c4c3d0f39a6dae7816b90cdb11
font_01_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 18364 bytes
SHA-256: 07c1234d36e17019d50a8712730c489acf148d9fe9273764fe27fb0e5da10e25
font_02_sfnt_off000136f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1