Malicious PDF — malware analysis report

Static analysis result for SHA-256 c616e2ecb3bdd7b9…

MALICIOUS

PDF

73.5 KB Created: 2021-09-20 03:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 93572c5d9c9ac089e976853d69d49942 SHA-1: fe17278ac81ffce2b6a0cf1c9987231ff11621b9 SHA-256: c616e2ecb3bdd7b99b73e7433d00d1c13ab45577013e539de053115358b46a8a
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 WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/e062cbe8071369c385cec579e1b7d444/pafaferunozevujomotebe.pdf In PDF document text
    • https://sibois.eu/userfiles/file/17183264344.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/wekama.pdfIn PDF document text
    • http://humanlitech.com/files/files/papukuwes.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/59309412583.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/44846469065.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/rulozusofasozatum.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/48447494191.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/bccfae152d4fdc7d1713e2a1bcb0c595/18716367681.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8a755b2caabe40cda4458cf8e455798d/90914204905.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/67121254580.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/kogani.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/65440012687.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/47698727685.pdfIn PDF document text
    • http://progetec.org/userfiles/files/foketedoriberiruboruleruw.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/34889488240.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/45644001783.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/fapedakozexumapu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ab313ea0f---30658641161.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/xeniwuxi.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • https://guanlai.tw/uploads/files/202109191601024181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=golf+foot+placementPDF 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_off0000be58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE58 10320 bytes
SHA-256: 509e3cc3237639783d5a1786851a384d5fa5993e0006dc6df8a30cf10bc6ce88
font_01_sfnt_off0000d5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A7 16504 bytes
SHA-256: eaf1a66ac2c2b1aeb3937eabf152ad5565a6a6f7d7414f26a0be22fe5dd93ca8
font_02_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1