Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed42dc35fa5d1da0…

MALICIOUS

PDF

82.6 KB Created: 2021-09-24 08:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7394ec500613eaeeaa3b01119a4ad3e0 SHA-1: 2425f59e00af05fe749b91efeed5040c779c5a52 SHA-256: ed42dc35fa5d1da074d25193e0b7124feb325f0e96edaa560fead22b8f2aadf4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of numerous links, including one pointing to a compromised WordPress upload, suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://designbyjoseph.com/uploads/File/57048840875.pdf In PDF document text
    • http://onnetsolution.in/userfiles/file/jirunaxiz.pdfIn PDF document text
    • https://blgjad.com/upload/files/zufixuni.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/vomopenazodikivewiruje.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/43862470482.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/nugomowulujubadujetebex.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/kokipetifo.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/8303979350.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/21201012420.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/90703190160.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/river.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8f18954d---bufikedanusoma.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/83930160251.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210902185152.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/378f8903b12ff73fdba636176ebd1d28/1708145940.pdfIn PDF document text
    • http://ciskmv.com/css/file/76428886498.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/73918336625.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/ramejekaxidizomup.pdfIn PDF document text
    • http://qwerty.pl/_data/file/lawev.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/jobudekiga.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30127029054.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161455a51415dd---8087283767.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/48168330126.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/88496759249.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/65639155153.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/19426357110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=dragon+story+hack+apkPDF 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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 18892 bytes
SHA-256: b94e2c2670a7b910ad6942464aebcaaa42c71e9165130ffc17bce93302e01ff9
font_02_sfnt_off00012454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12454 10588 bytes
SHA-256: 922fd5f2c96f5ce26c94e04cedfaa8c988b3cd9e8597ad4b1b2dd039d3380a19