Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ba17516b755657…

MALICIOUS

PDF

88.6 KB Created: 2021-09-07 20:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 26157089af632af11b2f7bba40b6b9df SHA-1: 1141a63764186084d108c99371881110a0e4b3e6 SHA-256: c2ba17516b7556575628d5f41f268bd9a0c758735f9eb2c55db3bde5bceb9a92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or a trojan downloader. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9jir9adomb2aoeclqu1r4dppa4/97621482693.pdf In PDF document text
    • http://donghotam.com/luutru/files/loxavizijorap.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/94757262205.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796c1362879---beburufoxepuzoxewo.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/812f5ab483cae8cc3375414887d0837a/72892888415.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/30516625387.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ads8uv6d1l33gd0d7e16shtdtr/32418517714.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6379aca8bd---28112578864.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b20dfed9f5d---48755081090.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/93275358509.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/4c5a5a67cb5bd09cd7c0aa1da6315281/xoponelelosujaki.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/55322671899.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/86310111183.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/xexanakawofiziz.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16099d3af64abf---rogebinokuda.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/tiwivugupoberewe.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/zevixakinijidomagab.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dffb32964c2---kilorexibiw.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/zesar.pdfIn PDF document text
    • http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/niwubitapamurujax.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/33558822401.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/kizisuwisawoverobo.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/tefukivamotol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=melhor+conversor+de+pdf+para+word+editavelPDF 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_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 10860 bytes
SHA-256: 6f90db96d6edc32440a8ff88d129b3821d2d1951afdf2eefa9c2a042fbb1aa9b
font_01_sfnt_off00010c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 18688 bytes
SHA-256: cbd6a57b79816215bfa0812f01d8b80fe8e79d3579d6499a50a8f50c7c9b30dd
font_02_sfnt_off00013c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1