Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0ad2fe1e7c4f00…

MALICIOUS

PDF

93.0 KB Created: 2021-07-06 22:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 13004c564809a8c398993fac12d5992c SHA-1: 9fbf82b6644bbdfe9e004289cdd1fc247e39877e SHA-256: 9a0ad2fe1e7c4f00a77d3b7a61f9b6c82583bc622edad601089c47b30f98a394
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://lacasedescaraibes.fr/file/buviforegofu.pdf In PDF document text
    • http://rzfmuhasebe.com/userfiles/file/bezakezuxe.pdfIn PDF document text
    • http://itfind.ru/uploads/file/17938359524.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/17267523396.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4412a9bd80---25107615243.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/8747e380c79d4c756430a898b48f574b/78813866372.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/nemesotin.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/9i3ghbs6rjh3skbj9pufphqvl6/nefexuvalunetari.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/botifefisa.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/5031085836.pdfIn PDF document text
    • http://nhs1968.com/clients/65482/File/82752851817.pdfIn PDF document text
    • http://anpo.vn/upload/files/51465766719.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b6b141a01---7183442236.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/banelakujanezojosofep.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/11859742675.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608649b888be1---jimanexixab.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/pepuwijegofukerataf.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/69424037792.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/rovatidujewijovepejunok.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160858288405a9---gulogewupimiwigalarukexas.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/wutefozoka.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xexuforenifa.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/1f0ad323bd014add3464e3c031082a4b/67523101983.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ece53ea99a---vetav.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/47049513016.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/78447423022.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf94e7f16c---4036873794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fright+night+2+new+bloodPDF 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_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 28104 bytes
SHA-256: b10d0ab6ab465bbcf23f2b1d4ad04b1a82ee5bb5136af405e5ce50319f48d0e3
font_01_sfnt_off00013535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4C 10520 bytes
SHA-256: f36d3e010dd2de76c47ce7008c3da1d296760457fc826b164cb33d19ae048907