Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c3dd0e19d4aca2…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 13:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e5e9d1553e2c96484dc639ebf78dba7 SHA-1: fdea2db4670027509af932ae1c0e9527d11aff84 SHA-256: c3c3dd0e19d4aca263747512b9fca3b60cfb61e1173529b07c0e9f142888e1b5
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gintaras.cz/userfiles/file/45021946306.pdf In PDF document text
    • http://diysmart.net/userfiles/file/jexizekiroxitev.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/54838485135.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/pasomonopozujate.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/33388624828.pdfIn PDF document text
    • http://ty-int.com/files/files/povul.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/47106524332.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210902125150.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90622591528.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/suzukegi.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/xusezoso.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161401b62b40e1---41258900036.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613675df12732---99161802749.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/fafasevavinepegivetupobi.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/t7mduvvekv7f486dun37cmqeen/33688851686.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210907104951.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/37373717514.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ocvu196839htn2qba5r342jkk4/muzijunezis.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/jeletokogerovesap.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/409194518.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/pilok.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/82851252045.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/643vbhgt9jjund924ne3ajpodg/xewuwelapota.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/gelogimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=hill+climb+racing+2+mod+apk+anti+banPDF 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_off0000d6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B3 10900 bytes
SHA-256: cb016187bfdf58fc653612241c00fb1c1a1755f54e613b06e98864260f3e018a
font_01_sfnt_off0000ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 18620 bytes
SHA-256: 7a808fbcb78e82459b486bd6526aefd139220977a1494c6470f3f6dad25be787
font_02_sfnt_off00012076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1