Malicious PDF — malware analysis report

Static analysis result for SHA-256 22523f02362c9af9…

MALICIOUS

PDF

129.9 KB Created: 2021-09-01 05:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bbe8bd2402a7f6cfb4fb22e2d79b72ff SHA-1: d4f436bf3d1c80adf1aeda0e5620bb332716da63 SHA-256: 22523f02362c9af9dc16e51a16c69d48d9a93e30d79bc16596ba9a9e1bfeb9fa
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a tactic to distribute malicious content or phish for credentials. The presence of multiple links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161030b01ba929---pefinudakuxaxikeliku.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6229b9b289---6329686563.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/92293077395.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/22058498829.pdfIn PDF document text
    • http://chinahongji.com/d/files/4164292981.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/fde468403e6280c98329e54d449b50f8/puxobipojodew.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/10700584404.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/givisutazaxifilewuxok.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae42a132c15---karenumeji.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210830_44CACD4A393FABA3.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097415c8d86e---kezuxugezijikanul.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7c3667a8c572f2e6c07d787920ff11eb/68874968867.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/gorisufusibofaji.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/begesexiro.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/kajasixa.pdfIn PDF document text
    • http://recviem.ru/img/upload/68671814834.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/74434478758.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ojthlqrajr39kg3vl8vjrbee3t/zevafijizoxorugotosab.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/jatixokikemajakufajix.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/64535695700.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607824ea916fc---38206014267.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/37754943710.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/5265917627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=eye+red+sore+and+sensitive+to+lightPDF 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_off0001953a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1953A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ad4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD4C 20068 bytes
SHA-256: e7e8efe019ee42223412fc26cc34aa4e6d4669b63b9762702b6d064b7582aace
font_02_sfnt_off0001e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E1B5 10688 bytes
SHA-256: 042bd8bc470518569638b874585d8a8df33f5e73e155b960309ae30c491d11e2