Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fa9dd57da6d609…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 17:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d34cf74d8772c4e1053d2c1643291dfb SHA-1: adc7bb9f14fdb3cb88276879cc4f1310e07ae4fd SHA-256: 66fa9dd57da6d609f03a46d1c3fac52fc44320a5d41360ff9bee1b76e9dfdebb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, potentially for phishing or to download further malicious content.

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://inwebjor.ru/uplcv?utm_term=total+sms+android PDF link annotation
    • https://larioenergy.net/uploads/file/18329485192.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/60997773528.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/xowevituvopomufemumibarod.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/b58b0723f435bab90801676228494fd4/votevidasekefukunigaravev.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614629465e40c---23026687113.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/35917103672.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/80126751401.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb81acf7bf---44317836161.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/50857833949.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/94838413696.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/senalefevapemuvogofi.pdfIn PDF document text
    • http://tfforming.ru/d/files/19285195922.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469e6212bb7---ruvodojebizujebafezoxuku.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161413ed88fee4---44747044290.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/lamexozobajavigob.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/37413363112.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/vufidisoludop.pdfIn PDF document text
    • http://nessium.net/userfiles/file/balol.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/614c3f57153fb.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/98324410661.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/25807754443.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/88301769103.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_off0000b0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AE 14996 bytes
SHA-256: 93c7606286f85eadaa0e4b73483e0e24875b9f3204062f88d9f67606f4c3aae3
font_01_sfnt_off0000d6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 10240 bytes
SHA-256: 814029a084e6a43092539ff0124ff530bea5f772afbac6cb430aba52105a437c