Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b28c4d05af1ac78…

MALICIOUS

PDF

113.6 KB Created: 2021-07-03 22:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2cd4cc147a9e774ba1ff6ec6421320cb SHA-1: a44212791efc28e388a3ff508f9eda43973a7a90 SHA-256: 9b28c4d05af1ac78c58187c718a56f784b3126401d2b33125964242b8d007f17
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://e-hane.com/files/44995140960.pdf In PDF document text
    • https://zzwgjx.com/d/files/kilafuwejariz.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160948f1753ca2---fizomivapalugaxutobuw.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/19841825571.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c53d9e8230---fewuwixej.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/5d97dc40abeccb6db7abcfe04671857f/kosufagira.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/26546312158.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/27577094016.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/dorukubapovirumuwo.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4d64cbffdd48fcafda080fd2edff2489/84979415708.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/bekakajefezakefujedumebe.pdfIn PDF document text
    • http://kudusde.org/resimler/files/tadobujariweder.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/30880426370.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210628021350_wmgr93.pdfIn PDF document text
    • https://vestol.bg/files/file/jeleselosat.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/9cff5eacc37c3085c9f442a7f9325c16/lalulemadudurokiko.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/sabibejije.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b24b218002e---mejafivuninukugo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cc62b9227b1---dupojipuxokefotebamomaj.pdfIn PDF document text
    • http://coclub-us.com/ckupload/files/9304900898.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/b38384bc6bab32ccead65491e92b1adb/kokoxemive.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc83ebeef53---legafiposizedid.pdfIn PDF document text
    • http://runo34.ru/attachments/file/48701702116.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d2f1d17aa52d0bfb1adfd186d0b06119/widirejuxadiner.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/47707741678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=trading+profit+and+loss+account+questions+and+answers+with+adjustmentsPDF 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_off00015649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15649 17872 bytes
SHA-256: 6ae267bfd0b4ad963c3128508027fd9f0244fb45186c848cba86ea10dbf386a6
font_01_sfnt_off000185a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185A2 11492 bytes
SHA-256: 5203ccdf2a33f0b4f5cc69e80e7d44fab1ce6d77a764c5f06abf78cb7d2ebdf8
font_02_sfnt_off0001a027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1