Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab036c7f45622c1…

MALICIOUS

PDF

68.9 KB Created: 2021-09-07 06:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f150ff880b419217c5ce75bdcc695b81 SHA-1: 6540ec3558124e013d721a4e1d944310d72793c0 SHA-256: 6ab036c7f45622c1a460902f1ccec7f0239a081f2e7288b6e8068b7dee122f63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to multiple compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611db7c629afa---wikofox.pdf In PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/91778661491.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/45891547375.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/tomejudebo.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/liten.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/rirosutolu.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/porukogebote.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d02edbv8v5eb1gs4lsij7m7u46/8168594796.pdfIn PDF document text
    • https://emmaushuis.org/pages/77456096512.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f967c078604cae784a1ccce2d4e15f5f/17877351450.pdfIn PDF document text
    • http://herve-coiffure.ci/files/dikifeloxugorevoxig.pdfIn PDF document text
    • https://harom.ro/files/file/54615009937.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607390375559c---85980225221.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94a5cef54e---vijowofevekuwude.pdfIn PDF document text
    • https://sapporopools.com/contents/files/dagepalumo.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/36370504413.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46ce692f9---xemode.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f088027721---46301765011.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/45942512247.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/64060785396.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/4tmqh72ek02981068eln9s4n0s/senatojiwaxepov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+to+epub+online+with+coverPDF 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_off0000acaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C1 16208 bytes
SHA-256: 3a38c2009de0077516b51b711f1f25cf3a82a859c83669f72b621c74109204fb
font_02_sfnt_off0000ec0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 10780 bytes
SHA-256: 9a5775170be188e9dbf0df2e11f4e8e872ca369f4adc0dec55249134ed68c470

Open this report in the interactive analyzer, or submit your own file for analysis.