Malicious PDF — malware analysis report

Static analysis result for SHA-256 6450e5850359d08e…

MALICIOUS

PDF

69.7 KB Created: 2021-09-18 05:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f38a722d3753a8bf45c1d808ffe6203a SHA-1: 20feec3c2320befaa2beb1de3f13ceb567d36bbd SHA-256: 6450e5850359d08ea21f94758c1e1ae023430e5f0dba80ee3db2c38b178be26e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://digicpictures.com/downloads/86362464812.pdf In PDF document text
    • https://njshore.drinkpoint.com/uploads/files/54030764206.pdfIn PDF document text
    • http://rrarental.org/upload/file/tefemejon.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/bobakokisubuligewel.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/68886165215.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/jemeluwafabol.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/xukiwedoviri.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f812e68ffb---93445806415.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/94656882141.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/48535019562.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/90609134144.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/xuxodepufazodizotozulo.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/31494392128.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/kuhj3tptn4kvuvu19qnd58mos4/zosigokudi.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/venukaxipujulapinafov.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/7014634492.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/nepesaguxatedalufanu.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c7460ac298bb370792c9f7ab861bc1c5/6964253702.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/mapemagapodilufexefojebe.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/65431117222.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/gidevu.pdfIn PDF document text
    • http://stattus.com/assets/file/7006488632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+go+hack+fake+gpsPDF 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_off0000b1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E7 15432 bytes
SHA-256: d2fccf8623570461a5dd767525cdcf50e8f4ad9429c3376558e9cb3231400829
font_02_sfnt_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 10684 bytes
SHA-256: 8369181c61084eef1af149cb6098dfe89b4d0b0ceea8a8011ce9e05ef10d39c8