Malicious PDF — malware analysis report

Static analysis result for SHA-256 2876cee8bff636cb…

MALICIOUS

PDF

92.2 KB Created: 2021-07-02 13:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9f4d3e079e90b9815d0606e0dde5f5df SHA-1: da937fbb3fa2e27e7f6b510bfa6012482fd31427 SHA-256: 2876cee8bff636cb93acec8aa5e3347f2cd8d5080a68fa47fc42bc07a214654a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution, by presenting a lure related to 'gsm technology'. The document body is heavily obfuscated and unreadable, but the heuristic firings and URL analysis confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://accesoriosalmayor.com/images/userfiles/file/bigenobikewipegela.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5d1479bd710e64c56c88179049279610/78316526694.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/96212095572.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dd7e87492---fofukugavavuvazusujet.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/68721400343.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/jupesesurarobofafo.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc9fa01a24---61460311853.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/kabefoguposifaxixanupajop.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/82a8dc411b5207d7e08b8b7972d45784/firowuguzuzar.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a775b7e225fadc7eb5ead55c7393d811/98691622834.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2deeb0a5c---92114998360.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/9e2339ffbb0e9b9c901d942551b5f102/nubigiserarurez.pdfIn PDF document text
    • https://bamor.org/userfiles/file/24005348359.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/sapikanazat.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/sewatupuxidirofad.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/266cbd53bbda42eb930584ff1c5f1696/46671077672.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5f6e70f0b708e8214e0ad5633a0fc4e9/zirasugetanefateza.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6b9e349171ebfe68a2c3d26ac66bfd21/tipazotoxusisewupinat.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/2565606716.pdfIn PDF document text
    • https://unosms.us/userfiles/file/28874952969.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/woponuf.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608f723e1b634---40478280085.pdfIn PDF document text
    • http://soles2walk.cz/data/file/nelisodigoso.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/936aaec24119707ee7773b0624c489f1/17368779776.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/43526034354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=gsm+technology+pdf+downloadPDF 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_off000103a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 11112 bytes
SHA-256: ebb11047984671031f0ce6b2b4a890cd97fe82cbac871c98d96bd2ab3efdbf68
font_02_sfnt_off00013566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13566 18596 bytes
SHA-256: 1d425e05e4ddbd25237aaa5c2b3bb58eb30f7b402024eb51e84c6337a8b780fa