Malicious PDF — malware analysis report

Static analysis result for SHA-256 9198fd754abb99ea…

MALICIOUS

PDF

81.3 KB Created: 2021-08-24 19:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 899087e1a06c205c0beef57a1b63f33e SHA-1: 2173b9498793e321edfad4c3227efced69c0276d SHA-256: 9198fd754abb99ea91e0a95b69dc1c821fa40b12110de3cddc23c32e05043c38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads. Several heuristics indicate that the PDF acts as a link farm, pointing to compromised WordPress sites and disposable hosting, likely to host or redirect to further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/973ba9b58f7f110dc3f0dc0fe4c8e690/2345552081.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609890516a68d---43520726779.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a908b305b39---86236393486.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/nodilivep.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/19576574804.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/a2h50rff782ppmi4i8j39c6935/wotelirubuzonofov.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609756b29f072---naxunorasedaxikelelovuv.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/45682595720.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9cd2d7dd4---47582736569.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/37379949461.pdfIn PDF document text
    • http://askort.pl/Upload/file/6258796.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b76e6e9f---84430600175.pdfIn PDF document text
    • http://aimic.com/userfiles/file/raxanolomexoruwedeno.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/31827134378.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/dejajofawevomanaxu.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/79908776841.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/59c444f58115aa37d5ac9edac5671f65/bibagalet.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/katofi.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/35972544479.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/gajusujufudaminixuzonopi.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/nenepudedubego.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/mimagazeg.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b140bfced19ffc1a083a40d0ef126c45/56067542965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+the+best+y+level+to+find+diamondsPDF 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_off0000db2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 16780 bytes
SHA-256: ce828016141a6dc5b1431dfd641159f87bdb1a80581243fc681c64666c275192
font_01_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 10832 bytes
SHA-256: d7262fcd65b31e5ac293a6e65dc497f4875b6b0d51f29d79e18b880f7c98f123
font_02_sfnt_off00011f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1