Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b917ba4cfda741…

MALICIOUS

PDF

74.5 KB Created: 2021-07-04 21:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 983ab65d6ea8950999428d2112251b33 SHA-1: 0c7c4d9336b224133b5245bdf302e3b7f3d3d10c SHA-256: b4b917ba4cfda741023dd02f74f03e6ff1b3bc968019c5b085091601c88b3e17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to direct users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pietroquatriniarchitetto.eu/userfiles/files/dupunus.pdf In PDF document text
    • http://helloshoppingnepal.com/userfiles/file/xumil.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/kepod.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087c6a2367aa---zenibitirerefibimudela.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b2d5016872dc474e7a65669fe046e12e/junif.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/37n3elodi31o091mgp5v958el8/zixagekegoxa.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/15136211593.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/76d31787212803f9119bdea0bbc8effd/doposizi.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd97a74949---sutoxabe.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/28698261822.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/35870511852.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/se99pi29ohq43t59gvkgqbuepi/79860337324.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/ropike.pdfIn PDF document text
    • http://119pump.net/d/files/12331993609.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/86719418092.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/dewewiradagosipirulalej.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a12788d8930---25152320186.pdfIn PDF document text
    • http://canvangdientu.com/images/file/zitujevatopupetese.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099327a76feb---71275510936.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/40433804482.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/2i2u2bpaktlueslat9usb484pt/5836292031.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d038065dc1---2785391129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=stock+markets+open+nowPDF 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_off0000c0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD900 10648 bytes
SHA-256: 342426f6ff353d9a5f3e7a627170825be4a37d3f825881afef1ddeb399e480db
font_02_sfnt_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 16792 bytes
SHA-256: 6f47adac0a73df58e70bdcc2b85cd7e7d4e72dd429663d61ee79b1e17718f555

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