Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af7ab25960627fa…

MALICIOUS

PDF

87.5 KB Created: 2021-08-22 04:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6985ec587fc176a3c30fe308c47167ce SHA-1: 5819555615b9d57cd40ba18b08c26a2e3dc2088b SHA-256: 6af7ab25960627fad695e4e7855a7c4d5be9b919be968d16d7672824d4003bd5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://yourbuilding.ru/userfiles/files/jejisiroxodore.pdf In PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd2ed5d45---60616383768.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/lfolvp87phii37gblv0eotlqi5/makobitidimetaga.pdfIn PDF document text
    • http://kaies.cn/upfiles/210705035616406003s9ufom.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/zexarir.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/3s9tubekjdm8qk2h29n43jh7qg/20704907383.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b689c2097d9---solepe.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/68046312357.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073492e8e5b4---25453742346.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610487600a2d4---34751992584.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210718_92768DF3B2D0DF1C.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e6a53d30f26b16e657c89f56aaad546d/lubivibokunox.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/kamejanepolod.pdfIn PDF document text
    • http://htwy.com/upload/file/winazap.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e269710fe---54009567445.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/61966508878.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/89227839306.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c542daf753---20252712309.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/98104867776.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161151e2aea4a3---52064031950.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/1d01c152f6feb9a7034aa40beb9c8aa9/walajenuzadosamesezu.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/96449259243.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/47711919993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=chemistry+lab+introduction+to+measurement+answer+key+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/lixutopu.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_off0000edc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 11448 bytes
SHA-256: b1064927f9c25bbc87043ff09c9b9949984c53cb689a2aae6574abebb57ad686
font_02_sfnt_off00012097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 17980 bytes
SHA-256: 1de4ec56163467fc65909baf6ca2b31a6a85c41ae576adc02ccdeee911f562a9