Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae3c5209f4ef0d0…

MALICIOUS

PDF

91.3 KB Created: 2021-08-21 10:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6678b4bd8db8dea828a789e931d46924 SHA-1: e0dafe8c647bd112f6e6715eae5340fd15a3257a SHA-256: dae3c5209f4ef0d011dccded37929acb68ee15a749c1764edaa12a81be148ed6
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The document body is unreadable, but the heuristics and URL analysis strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://gesundimjob.at/images/content/files/9271448570.pdf In PDF document text
    • http://seibyou-koujien.com/files/files/54295806135.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b83c9ab54---98081814310.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/rupofokabarulul.pdfIn PDF document text
    • http://industrialdevices.in/uploads/34400634538.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/gabisudeno.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/74431573406.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/24c2fa170d75ef394f7c99e2b61ef1ec/54971610233.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/dq1cbuitvua8e9siela4rudat2/sowejigusajuduxanirege.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/vijewiw.pdfIn PDF document text
    • http://mldinsaat.com/image/files/jifadonekabo.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/zezezizixomamomegak.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a17d7643100---57335116940.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/54d3cca3c057b5cde111e379fc87beae/mefuxaletozenu.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/fowufigadanakoxuvijepini.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4f46573a1---37155647863.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608279395f800---badogirinugoxire.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/86435620024.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6a0c68003---45672902797.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e7758367784---68375002113.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/72645600070.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vumezur.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/b279c58b765715e8af0f9a85cd6c1fa3/jojubobodozokapapew.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7eae0701df31fb8facec2415fa7a244c/24023615991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ethiopian+grade+2+english+textbook+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 20296 bytes
SHA-256: 99cbbe449d4fdd8a792d7b8cc5c95c03ac9f824e1c80c0b46e56ecae30635311
font_01_sfnt_off000116f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 16336 bytes
SHA-256: ce1e260ce6cb614b3d979ab9e48e0dec8d8a42e8e8ed8643cd2624ed245d1dba
font_02_sfnt_off00012d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14566 11212 bytes
SHA-256: f6a5fb923ad301958193f519a34a84bfc9b24bb3ec9ddd31e6058b38b832ff35

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