Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8f2f3e10d0b8a7…

MALICIOUS

PDF

100.2 KB Created: 2021-07-23 20:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cf2c3caae20193099298d3c4f09544b SHA-1: 1d3140f80aebe534107599ef091dc46ad4d9e5b5 SHA-256: 8a8f2f3e10d0b8a7613816a58fc9384a989cfa5ab6fc56f984dafbccc57d4ef6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addcf1a60f8---rutusufikaxujasesekow.pdf
    • http://salinahighschool1967.com/clients/c/c9/c9c88be04994199279bceb128c91314f/File/57071304506.pdf
    • http://goref.ru/files/file/67567454556.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/16458141991.pdf
    • http://handbook.hu/upload/page/file/71785987919.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/nowavo.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16071b2f6a3820---boxanejorumal.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb62b5d90---69631074275.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2f3313e54---zikotodadasaw.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9a62aa69---4428845164.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a8f185ad7---44031839493.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/03t0enleeq1lv53d0mhnfa4lc7/63816249553.pdf
    • http://dd-eng.com/files/files/12030899793.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092ad580e95a---71045788650.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f527e4f3b---mirola.pdf
    • https://fanaf.comarticle_ressources/file/58606012631.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/933dau2knt0ip990t9ovnegeub/99480995299.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fab1497633d---pugub.pdf
    • http://chinawin-consult.com/userfiles/52754545897.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/9f8p9ri9lksssmtkh3mvchh6q4/pajirurasurulaweturesi.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c9addecb49f084fa44cc0fbe40ada754/patazivigejewuvanoxu.pdf
    • https://alakharia.com/public_html/userfiles/file/29159457040.pdf
    • https://langestrand.se/anvandarbilder/204/files/paporuxupodonaxajizesozoj.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/aebd8c75a4b7b5b13ad79deffde2447d/73608173706.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b78e6611e---27040357091.pdf
    • http://taxilitomerice.cz/ckfinder/userfiles/files/76040726999.pdf
    • http://ambcavallon.eu/userfiles/files/fonulifujob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=conjonction+de+coordination+n%C3%A9erlandais+exercices
    • 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_off00011a77.bin
f125e95016db1aa17dd8b80009db910fa4ed9e72946213f7849f6110e6416110		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 20572 bytes
font_01_sfnt_off00014e75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E75 16792 bytes
font_02_sfnt_off0001668c.bin
0873edeb4bcad3a5f7dc90a0c65f94e660d8367a63d3f76e1e1ee90c391495eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1668C 10780 bytes

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