Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b594c107ba4bd37…

MALICIOUS

PDF

125.2 KB Created: 2021-06-26 01:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 879807fe50afd94150eee9b5e74274b6 SHA-1: 986eadf5c9ffbf6c78f076c08db87302411457d6 SHA-256: 1b594c107ba4bd37b829f188da24a36e33a91055502058b83bc156b7cda316fb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the nature of the link farm and the detection scores strongly suggest an exploitation attempt, likely via a malicious PDF exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/21aab213d0226561c7ed614f04d8b593/xawiwelomupetaluxovaxoral.pdf In PDF document text
    • https://landbar.com/upload/files/73489155697.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608513fe0b9d6---xepovetodudis.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/iv42dd4pdklr1t9lj42jksa88u/pipesudirakepafizasim.pdfIn PDF document text
    • http://arslanemlak.com/E/file/xewizetojitusuwewogoxiget.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/zivemafowim.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607247d3b0894---sawudoguguz.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0h5mff0mssm3k6nc88jv989ps2/25075575261.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbe4fec991---88342140561.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/jesuzo.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/fupibuwusasufiw.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bedb10bffc7---nimamukajenuvafobisarine.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/d6327d5b895b61744234ec698fb3b67d/sosaj.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/500237996.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/595b2npu894io7nr67bdhgp9is/bopujanaxoravufebapotumu.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d93983da8---99218694607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+secrets+of+the+golden+compass+2007PDF 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_off00018587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D99 18536 bytes
SHA-256: 4d059c57a3371663d649e3c420701ce9084e2fe26ccb42fc06b6446e23043a57
font_02_sfnt_off0001ce39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE39 11228 bytes
SHA-256: b4ef390f9cb5a37303a81502ea9b45081b9960406a5c39bdcb9a1fb4a75972ff