Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8e8502845166f1…

MALICIOUS

PDF

88.3 KB Created: 2021-09-08 02:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 06d8d698c411e82156a88869c221e8de SHA-1: d0d1fe83170bec6384b2a6ae807c8f2ccadfca77 SHA-256: fe8e8502845166f176c534293d5fcb8461146cfb8dec89bf1ec68c1c972a44e1
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 ML classifiers indicate a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and link farms indicates an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://wastran.ru/uplcv?utm_term=spanish+contractions+al+and+del+worksheet PDF link annotation
    • http://es-manzokudou.com/yamituki-n/uploads/files/57689026258.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946aa4cde41---16977598550.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/jezimenudubuxowigosa.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a391b232138---jisafumegezezukerud.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4d179fd03---mizaritosi.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b4eb4fb7---16573160851.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/gebukapaxol.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/46365085015.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/40f78e3041e53a2626ee9cb9d8fb3fd1/ladipuvowu.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d77887501a7---levuwekubulu.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/99091343261.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d5338087e---56179018975.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c6649797b---zujol.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hpebm0mjgj4j2voc30ela0dpi5/50570553994.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086656583f9e---94322388587.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/jekemobipebenunapokil.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/bstqv555a2b4m6ckmkm1l9bspf/nekosisi.pdfIn PDF document text
    • http://unsersohn.ch/images/file/73254075591.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaefdf25a2---98760566871.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/kikijirim.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/49886523615.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/sezolibopobakilato.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/54806944408.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609214a01b7be---patuxezetoxagusizewu.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/91217798809.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ecca5c7f3---93026895623.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_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 10864 bytes
SHA-256: de969d530f5655f395cfba025b7d5bdc5fa67d8d512b2161ff72b49ca7acc1c0
font_01_sfnt_off000106f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F5 20316 bytes
SHA-256: b470b0da1d5ad5b1ac03ab4706c059be0eb3d60aa11bceafe55571d6eed22701
font_02_sfnt_off00013b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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