Malicious PDF — malware analysis report

Static analysis result for SHA-256 17dd39ebea0213fd…

MALICIOUS

PDF

71.0 KB Created: 2021-09-04 10:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ef118d9414be44341a7250ceeac86e2c SHA-1: 5dcf05b145ed6e402f323144ca11480533229f36 SHA-256: 17dd39ebea0213fda76d130055598f015578ab73cfc62fc0b5b404c1e4dac0ff
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting domains. These URLs likely serve as a link farm to redirect users to malicious sites, potentially for phishing or malware delivery.

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 http://reclameindex.nl/images/uploads/14288472705.pdf In PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc9c47beaf---debibedagez.pdfIn PDF document text
    • http://gapp.fr/medias/files/8521068557.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/59505876273.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/19148988920.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/jisulonijisiribotemekipo.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/kiderunivasafaj.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1211b3572---watotagelofejibi.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/b539062b2d464aecf785a8a889eaf637/55380906010.pdfIn PDF document text
    • http://flexicourse.cz/res/file/24384889768.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/vagemomivezizikeves.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16074d34813f7d---37492277604.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/xanefokosipozavi.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/76725522703.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/38694160821.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160820ca6dff25---87844298898.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/f6d2286873f81f93c565e4e99a54bbac/37762104832.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/cad150077edb1237a662f70925a49602/14570021418.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/aaae74b4acf7b7177d68887992ebd87f/82078792904.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/24361884482.pdfIn PDF document text
    • https://airbays.com/userfiles/file/turunupa.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/jufabugakunowomos.pdfIn PDF document text
    • http://mid-europe-ex.com/23183934298.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3515a1d952---69278581138.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210808_091655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=el+pollo+loco+nutrition+pdfPDF 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_off0000b5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B5 10236 bytes
SHA-256: cef3b7a246431f7774476b62fea3fc101793e29b1c5a32abc39cfcf9c6f1b85c
font_01_sfnt_off0000ccba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 16284 bytes
SHA-256: ae54565850ebbf2815f9c80665854436ce7bb5acfab31c57cdeccf2c675f1d42

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