Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b88697174fa47bc…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 01:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8204947eed013a21e5fa3eb13f7f70b4 SHA-1: 3d7d4a92a928ca60997508e97aba7c38128880dc SHA-256: 8b88697174fa47bc0652c09266ead38214e4f9e6337438e2e6f05a4e6c976ac9
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://dcoderesearch.com/uploads/61367546122.pdf In PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd8ce047cb---68177006740.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/77583253603.pdfIn PDF document text
    • https://tempegaring.com/contents/files/kamevabeparagazetemu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe0ce6185---1059531469.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210714_17EA3DAA783383AE.pdfIn PDF document text
    • http://chromoink.com/updates/file/sivafulipatapen.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160748fe72fe74---fawidopepozorujenuxasun.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768682bbc95---rezamigugut.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075861aeb4b8---kipetigiliziruzux.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/pepanitovesazo.pdfIn PDF document text
    • http://rc-modeller.se/images/file///99624452010.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/lmojoiq9fafkr94qmdr92pvmiq/50915912904.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/27635216853.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/42033840101.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de796d00047---wediwonenasusor.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/kvv2d9n2i0a15qvt0s09urnmtc/10943044283.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/8743444587.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b27b8df3ba7---gewidem.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/sakevanaz.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/jarofibe.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/61332060943.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/xoluvesawusuvex.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/da34077d23272c436793a10682e2e6b8/9066881603.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210718233644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+download+fortnite+on+mobile+2021PDF 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_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 18304 bytes
SHA-256: 6643d0936112477248c771a18fed36910ed67e0ac6baf18e858a5e112c6f3364
font_01_sfnt_off0001187a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187A 10856 bytes
SHA-256: dd5d436638a86a728ee4f4464769633eefab3b14c9b827ba7323cf36a4babc7f
font_02_sfnt_off00013195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1