Malicious PDF — malware analysis report

Static analysis result for SHA-256 25de39bfb8320983…

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 01:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 049a6663fc464116d24a8d3ebc2ec8b1 SHA-1: ba15add501877ea522e373d48d8825696f70892c SHA-256: 25de39bfb83209831a3115bccd5eeddfcff698561d2601dee31d320cafae2189
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=present+simple+vs+present+continuous+pdf+quiz PDF link annotation
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075826bec8ab---mezonomoselulog.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/19f785ec052dfce61af778177bd890fd/39377964544.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/dudodunarufafofagi.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/aebutq9tbanbnpfgl4kuiovchv/folinanudaguvojufu.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/90861096056.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd8a88230b---vanukatutarapisomalu.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/gizofivatuna.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/69560870426.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/xilifudoxos.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4e6b29ac---gulupowedisavasanud.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/xaterapajovurogabivexu.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/88447280781.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/93097729030.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/wiseri.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/kibugevobikunimupemafav.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/35289758895.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9ac49a31c---39384857935.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/bulutu.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/19081009580.pdfIn PDF document text
    • https://kildevangen.dk/files/xebelekibu.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/85750583289.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da680b0a6c3---pujosovavifez.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/79117646151.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16101466b40ad6---mafaxuweferobutazugil.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/86a9415efec0b29d2e80f3c9d6142754/dulifuzavudelawineted.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_off0000d16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16F 17560 bytes
SHA-256: 3f9a2c8279fa3ac78647c853599284b68a965d19e8a3eb0438176bb1938acb76
font_01_sfnt_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 10992 bytes
SHA-256: 5fd58c0dba6cba69a1614796f96266d0be6213d8c4313dfc0e5d628be3241d79

Open this report in the interactive analyzer, or submit your own file for analysis.