Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1cbe61adb2ba5c…

MALICIOUS

PDF

87.4 KB Created: 2021-09-02 12:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 717775a7ade70a831c5543bf375da79e SHA-1: 3638afdad8aab76c19f22732da1892e316f0e96c SHA-256: dd1cbe61adb2ba5c496a6d97f2cfc05213d629263a428298624059617bc8fa51
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/a4uk8o1nlhvq62fhqtk4sivp00/60912356812.pdf In PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadf3f6aff8---sebipi.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ovd2vbhp9ubl5apqor6osejnk3/jafovuderilenaxebagarof.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/50111049166.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/93502459631.pdfIn PDF document text
    • http://soc-in.com/data/media/files/wusimikalomu.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/9706643886.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/mofaburezo.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/34220105669.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/tiberus.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/21536319579.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/tozoxudam.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/kadib.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/eputfslv73rlrcu0aueg2593u7/ramup.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/nuwasoxige.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/33857078594968792c48ab7159a2b217/guziburexinevamuni.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/forivopafifawunevofekome.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/n2mula1aq5gm155iss9spcggjv/16221413717.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160966702d38e2---29428756035.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2779952b2---gimoxegurunugi.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/91968271665.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/85875134266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=navi+mumbai+development+plan+map+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9a9978d975164f812fed667593a846c2/17663410921.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_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 18212 bytes
SHA-256: 50dff53691fb5ea1b8215cb2aea7acfff314a2f3faf7a025c3746d233c3823f6
font_01_sfnt_off00012044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 10672 bytes
SHA-256: 9b481ed8ea635bb4441a164d4e015df03c7bda69195007ed3b97ce1f8ef184dc
font_02_sfnt_off0001387a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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