Malicious PDF — malware analysis report

Static analysis result for SHA-256 c995d4e97e64cbd8…

MALICIOUS

PDF

77.6 KB Created: 2021-10-10 05:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8929486505f2f2d9e3c3f50de1928073 SHA-1: daf0e43c92430a6d6dd7fa3186c9234c7a3f03ee SHA-256: c995d4e97e64cbd8bf1581eb100fb585a41555605d349014314ce78aaf7ddd5a
124 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, several of which are identified as compromised WordPress uploads. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The document body is unreadable binary data, indicating it's not meant for human consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4752

Heuristics 5

  • 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
  • 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://tjpapigroup3.com/contents/files/xoloboliwidoxemo.pdf In PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161414d05efba4---jevonarunexiwakik.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/28445712899.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/67725127881.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/90587313129.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/juwixudabutetezodeweb.pdfIn PDF document text
    • http://apothepharma.com/upload/files/86379635586.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/26941539683.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/22513682736.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/pogewiterunibigivon.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/pamibatelomozavi.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/tilolavegub.pdfIn PDF document text
    • http://asfalon.com/__files/file/mejasezufaw.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/61221794037.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/95359502621.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/92003759634.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/bb77454c3819fafb45a2e83a4d885440/wejulaxesolegujaxozajopix.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/8dljo31bsjg7gb4vnjp82h366t/rezuvowagoxu.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/rewapefuv.pdfIn PDF document text
    • http://beldapromosyon.com/calisma2/files/uploads/36839954651.pdfIn PDF document text
    • https://capecoralliving.com/media/file/35686088245.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/doxis.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/povodabirunojuxudutawo.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/89513885924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+force+of+gravity+varies+with+thePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65E 10692 bytes
SHA-256: 9fad12762711e3cdfa0b4e861defec60a9230975391081eb1602bcb33eb7138f
font_01_sfnt_off0000ff2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1