Malicious PDF — malware analysis report

Static analysis result for SHA-256 829319f6e7818d21…

MALICIOUS

PDF

88.7 KB Created: 2021-07-08 06:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30640c20118c84d5c383d6b8da10cef5 SHA-1: 358cd6e1615a169b6deb28c64aa7cb36b870ce37 SHA-256: 829319f6e7818d215acef3bf801562124bb1ed25babe3204d32394501e22c10d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains numerous embedded URLs, many pointing to compromised WordPress sites and link farms, suggesting an attempt to redirect users to malicious content. The PDF structure and the presence of external URIs indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2520

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://inwebjor.ru/uplcv?utm_term=physical+quantities+and+measurement+worksheets+pdf PDF link annotation
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/3d1901601240a4fba55eb6fbefad56f2/10001649819.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/o051fps05km8peg92mp9q6nj52/11789942365.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/23272225787.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/gezirivirab.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/bikutenefafelubis.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/44963149229.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b215e5b2f1---bibosoranukagunozo.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/44240676784.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bd82d821286---21615952883.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/acc9e71a617b003f9f487dbe0650869a/76911052557.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/3bc52c4c6e947bcd4806a17b41f7d56a/mukiwovitub.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/2710te079vs8oc9cgrl45ejiop/jugujize.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/38901285272.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/54675525842.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/80959459793.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/kenokiwu.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/6bc0776f2303a9a7c9deb900d0302e5e/sagojibilobofopawitesatef.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/73757a5b42236de2623696c4a2e39e0e/75953764738.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088de54addef---23868910942.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/jorafujudivazudubilux.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d723de7c2---43290302582.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0e1bcce67---gopawugenuwa.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/27133924617.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/jiwuzuso.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ccaf1b24c---7776841897.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b942eace---41828253296.pdfIn PDF document text
    • 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_off00010c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AB 17388 bytes
SHA-256: e980f180077d6f5dd3186462514a12372aac6944745a9efc35b13ffceb31b226