Malicious PDF — malware analysis report

Static analysis result for SHA-256 af005ea026d4c54c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 13:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c185a742510fe238d99e6c3ea810d956 SHA-1: de9456e915a6579dcc9df0b0c6b32e2101c46175 SHA-256: af005ea026d4c54ca3f222d3b88d19ef5fa6e484e8afb33694a354f95aa5e81a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to websites that appear to be compromised WordPress installations. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=wwe+wr3d+2k20+mod+download PDF link annotation
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613141644c567---50414586109.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/valadon.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/18064330149.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/masusad.pdfIn PDF document text
    • http://scpt.it/userfiles/files/guved.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/57922953256.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc3d06089---18051321791.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/xagitadutuzipami.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/mabavufafumuzunib.pdfIn PDF document text
    • http://placc.info/up_image/vusibisaxufajaxidekiruwe.pdfIn PDF document text
    • http://vkts.se/userfiles/file/fuzibi.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/90537753124.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/vimefox.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/kozuse.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/57634378055.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/zababemiloj.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca7dd759a1---10254804662.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/53659662868.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/zanupikabakaxijusup.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/fc3ccbb7ce142dbeb68b95246bab1e52/37436064422.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/17521012946.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/88263882504.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/59266461656.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_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 10636 bytes
SHA-256: 92c70d3049b76ff434d6aa844fbc97d3738bf8c71757b7ee614799f4510ed8d8
font_01_sfnt_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 19852 bytes
SHA-256: 1a01b8a4a79c12dc2f005843da80da0814e226253c12e54b18a4b7183bc566ae