Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c07f2c89f495d1…

MALICIOUS

PDF

104.3 KB Created: 2021-08-06 21:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 119dd1c9f9fd801f9f6145b28ed6be7b SHA-1: c35b2c717373f701babb0b6d61d3845492b0c0a1 SHA-256: b5c07f2c89f495d1277ba43b170b40a42d1e1dcdae697d6b16f79b7aa934f65b
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised websites, many of which host PDF files, suggesting an attempt to distribute further malicious content or phish for credentials. The presence of a visual download button lure reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c924e1c0219---mekakigonujinifewebolediz.pdf In PDF document text
    • https://diedacorporation.net/freesiafiles/file/kudaxus.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/76025229723.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/duvosorivimesekiva.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/65370044393.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0157256238a3e5db416aea1b032e640f/lupigutitojade.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/d79976d071a8c368e886e6057d3ad78e/ranopugonalox.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/nimunepatamofeka.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/13568085586.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/gewuga.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/30727831909.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ba3f13432---wofunisitusariv.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/62979458407.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882eeb77713---degepumifetigezena.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/85089427913.pdfIn PDF document text
    • http://susanirvine.com/clients/82887/File/foruzawizexez.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fbadee1aff2---59952127751.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/27464032381.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac07970f7b7---39796592902.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/38833512938.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/1i8ohpu2giljdnv835q9jg7ks2/12280115326.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/movarubexazilefuxavetegi.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/33340153797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=inter+2nd+year+english+textbook+pdf+2018PDF 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_off00012dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBA 19012 bytes
SHA-256: df706c812a5db30fdaf6d0568c347374a8d43a0726389ebe8c52c9809aaf1de0
font_01_sfnt_off00015fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000177e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177E2 11676 bytes
SHA-256: 600b56cb2e63259e7fb933b8524556a770f6fa4b85d5ffa22ba4a30c8e35d1f6