Malicious PDF — malware analysis report

Static analysis result for SHA-256 806ca8118a7d75c5…

MALICIOUS

PDF

74.7 KB Created: 2021-09-12 17:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c8ba19824438b66a059c58bf26ec2473 SHA-1: ad492f89dbb9ac476ae38f1a0a1209ffc021ae41 SHA-256: 806ca8118a7d75c5a978a9b71b0a67d860228e64ce0964fa80fe428f6ce5ffb7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to multiple compromised websites and disposable hosting. The embedded URLs, such as those found on compromised WordPress sites, suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b69afb323c---jusomonatidagitomabade.pdf In PDF document text
    • http://artdental.hu/editor_up/32199480775.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/tupexanirenukimuk.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210904_0D9FCBEE89A03888.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/naxilupupa.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/54100985253.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/69498292131.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/fadilunomufitagozazugo.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/73068227832.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/tamigekozefefutalolifemo.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/50550690006.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/xezarimebekurebod.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/96347656922.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/23638489451.pdfIn PDF document text
    • https://cmoretv.com/userfiles/nolowunir.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/15166622600.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/47157781685.pdfIn PDF document text
    • http://krzeptowski.pl/file/95172789102.pdfIn PDF document text
    • https://path.mn/userfiles/files/29748222643.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa782a035c---18353903859.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386b76cd6fa---7924698387.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/bobogowoxepidizi.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/fuvajolofabofomawafonag.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/95821972499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hiding+text+messages+on+androidPDF 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_off0000c0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DA 16928 bytes
SHA-256: 91e429c32dfedf338328ba084986a801b82a09a717f21d7ace04ba27909faaeb
font_01_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 10636 bytes
SHA-256: 6624a58f4da7dfa0328e0b28ccaecf340f05e63505428af7c72b1062682c1228
font_02_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1