Malicious PDF — malware analysis report

Static analysis result for SHA-256 753745724d5a6422…

MALICIOUS

PDF

88.1 KB Created: 2021-09-03 19:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1be906e305df51efc09041bbb626ffd9 SHA-1: 4a12d48aacac1def4aebbc2ebcf83b96a0804b9d SHA-256: 753745724d5a6422aaa70700cebaf0317cf0009b0a67c941e55e5b6c13468450
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://locktactyuma.com/ckfinder/userfiles/files/xofasovebigaweromopares.pdf In PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/72328798387.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072d3d0a314d---dokuravaxav.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/subuvofe.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/42141129443.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/kilezinowuwuvimatarumewi.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/fivovakuwixunoriludex.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/92519290298.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6662eb79f---zorodavafedakeguf.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdbd051c51---juzejarosaleruwikixeteb.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/sisefe.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/340215497.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/vubinevonajupufizoripi.pdfIn PDF document text
    • http://allasclub.com/campannas/file/30013090597.pdfIn PDF document text
    • http://strategieb2b.com/userfiles/file/45913226700.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607360567f4e2---kufomigiwizibisuwakoxoz.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/695b833e7ccacc1cfe65dec8a1894f9c/51123867325.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/fulogasu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/37488994733.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160928f1eb07ed---vudujumixen.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/ravasakifolutanumerurema.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8b8f48047d511e05cecbff2699f828be/12602750682.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/vifagozeworizipanilawojuf.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27fcc69c3---626991936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=parts+of+a+sentence+worksheet+8th+gradePDF 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_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 11004 bytes
SHA-256: 902ea597e4890323766304abda1f40d58821f0793b1b521f58d928fbb79af5ca
font_01_sfnt_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 18568 bytes
SHA-256: 77bd2bd3baee084e01e73dc2579a19908f3f0128b834674716895357cc59b2e8
font_02_sfnt_off00013c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1