Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb1935ec3c94078…

MALICIOUS

PDF

82.5 KB Created: 2021-08-29 09:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 95af2c4693a844ea7cd7256daff9fbb9 SHA-1: c065b808d95acbaf5cd3f7ac759816fb9e859206 SHA-256: ccb1935ec3c9407843686f724f5db304f3bb2a4a8ac861515f5abba591843f20
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. These links are likely intended to lure users to malicious or phishing websites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb8853870e---linix.pdf In PDF document text
    • https://autosaloncenter.com/uploads/file/76489332565.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160855685d1dbc---52065134858.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/61071908401.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/dapogebepinerutofotonobit.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1294abeada824af7f8302ef826d815d8/23972959014.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/9326f5a585b1c00207ce7217efeda4c6/93841090954.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ad201b6f---mozoxiz.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c6366ba90---4572122185.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/21681972338.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/busedinu.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/rudagexemixexez.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/nulewuzovupokadonituzewiw.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/238b1f183fb1f591f10fabf8c52e7943/60576286666.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ab12ccf231b---lomomiwipuwereguxu.pdfIn PDF document text
    • http://tulga.ru/editor/files/pemawugoteteluju.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/22266685352.pdfIn PDF document text
    • http://195exim.com/datas/files/65923260053.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/pudimuxawis.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d453b49859e---zaxabamudutaluxekelopem.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/selakabutelubimiv.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/893b2ed9a435c7f112c8610677349717/madofel.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/10936135762.pdfIn PDF document text
    • http://metallpress.info/files/xosepiregeforetusudogur.pdfIn PDF document text
    • https://loctra.net/userfiles/file/48460701087.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/wemameti.pdfIn PDF document text
    • http://rafaelokazakov.com/file/71141111682.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/fatar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=non+disruptive+meaningPDF 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_off0000d76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 19140 bytes
SHA-256: c2fbd9e6c37b312b82e92992c5f28c7f9a9aa3ed61ef3cc3f37a4e40364570b1
font_01_sfnt_off000108b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 10832 bytes
SHA-256: efc6f49dd0dae225351edf2cadf5bc86c647eead9920cea908ab8dea779517b8
font_02_sfnt_off0001218a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1