Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fcdafd7f2ece049…

MALICIOUS

PDF

76.2 KB Created: 2021-09-01 04:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 16ff640dbe2dea513a7a98f2fb9342b9 SHA-1: 56b1360dfd0bcf37b95d5041897a56b82fc26002 SHA-256: 2fcdafd7f2ece049b3a6dc798173247180e1ad88a2f23751e19acd13b144071e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of directing users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=good+night+my+love+and+sweet+dreams PDF link annotation
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f583c2aa1a---1903173499.pdfIn PDF document text
    • https://jurad.eu/files/file/gobolonalusoxofif.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/xuvenajogoku.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/6657143471.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/42594990716.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ft8michqv03i3nj8us86ppav9l/xozuv.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f65a9664d66c718f15adf75dc5899fd5/jiniwutafazunobadujaj.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/61668113996.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/furuwaxanu.pdfIn PDF document text
    • http://aweibel.com/Photo/file/pomoromubojolodi.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0016e59169---wewalotuboforo.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/ganopirigabamulixafu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c00e9940c5c---34628063604.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/busikelof.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/67129292447.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/74338765901.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/garupiti.pdfIn PDF document text
    • http://mamitobe.ru/files/file/zarowunokimaketo.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/60185646181.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/nawurubidurewot.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/wadiwawitemewi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abbb953776---62322424847.pdfIn PDF document text
    • https://anaksemut.com/contents//files/bapezedowakovebemuver.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/79fea212cff23e6917cec50ae2fd9bbe/22444706360.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/fifum.pdfIn PDF document text
    • 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_off0000c822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC822 15988 bytes
SHA-256: e2241b6df908b7ea0f01a12f31786b5654313de74c7b27b0a803420ab37624f8
font_01_sfnt_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 11000 bytes
SHA-256: 39d31d1a51e18e89aa231c1193f403c67a80a16f721e1202b99160660ea331ed
font_02_sfnt_off00010a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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