Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d01f508482e28a…

MALICIOUS

PDF

90.2 KB Created: 2021-06-26 21:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54562d220d6b5c8f1df138659b5c4b9b SHA-1: 694fdf42da8d0060ef172f5b11368783de194310 SHA-256: 85d01f508482e28a849b9504e5a505bf4aa0b88f5968bd94f0488a843dae9556
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a link farm that points to compromised WordPress upload storage, suggesting an attempt to distribute further malware or redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious intent to trick users into downloading harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=haley+michaelson+the+originals
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16072302317cb5---69480948100.pdf
    • http://bensonlandscape.com/editorData/file/rezixodajekuxi.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eccbbae57---zonurogifigokuzaxulib.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca40d773067---ritili.pdf
    • https://baongochoa.com/upload/file/bipebenim.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d46c95528---49874546851.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afd12f91c32---zenunidalawubuzu.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc7bf97baa---34772028022.pdf
    • https://sambelteri.com/contents//files/36461011092.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c024418da2f---sazofexuvalotidaguda.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/semunofuzova.pdf
    • https://bookatowncar.com/userfiles/file/69327788756.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/1sik7gvbououv1eh7vvbmcepkl/39133200440.pdf
    • http://esoftland.com/userfiles/file/rojazibafari.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/9ojehkk0aape6t4hmj5gh78054/23029836927.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b4e41fbb6958c0fd1fa6c2a4fa65c599/37933452562.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d077a2bffd---posejuzekobaveda.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/ac36cc6355355be4379f2b108fdc1d6a/sasivekeviwor.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/ui6iirkijh85dd3hn9p1gaqifq/sawukat.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079bd0aa3edb---xununipobu.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded7b47b61---sibolekimuza.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c57405807---tebixiro.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/14447053093.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 16792 bytes
font_01_sfnt_off00011586.bin
ba7fff4fabc8af5bf9e55637328f750d52d3f29b25fd4be2b1faef8cec46f8d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 10780 bytes
font_02_sfnt_off00012e28.bin
342eb3870e18cff9e7d41b6c59346cc8a92848a75cd6a1bc499be74e5b8d7add		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E28 17488 bytes

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