Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1a521b32809c74…

MALICIOUS

PDF

92.9 KB Created: 2021-08-23 15:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 964be84554bf90c9318247aec2f66182 SHA-1: 6319bbd7ea6b64ee3b93e6a7743408ba2cef93fe SHA-256: 1b1a521b32809c745a5f7693a153d20bda133d76fcd64096eeb7b531470094db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress uploads. The embedded JavaScript likely facilitates the redirection or execution of malicious content, while the link farm serves to obscure the ultimate destination. The presence of multiple URLs hosted on various domains, some appearing to be compromised CMS uploads, suggests an attempt to distribute malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/gezulonakez.pdf In PDF document text
    • http://gnatowski.pl/attachments/file/25237298879.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e6056c7d903335388a6b503d2e88f1bc/4943681971.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607afbbaa47f4---siditajejibunowegowozo.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/94416f74e19052a6f305002df7ea652b/sivatu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16074798ed9560---16937141311.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/fupedubuvofipa.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b5fe216d5b7f22d15dc9b0a058489415/wuvitowawopepi.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16100665979f4e---65948120845.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a948df54eff---12884438058.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/batovu.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/15836199513.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/25678375539.pdfIn PDF document text
    • https://www.cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/15277460199.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qk0e1b6f4nfvn9rfie5mlngptj/36032562785.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/03urf18lslfjhk6jld89eb0ceq/58938932841.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/xerodoza.pdfIn PDF document text
    • http://venturahigh1967.com/clients/40640/File/juxanuzebobosanokubi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b147dd60ffc---wunaregufaporujan.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/77652661232.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/26775219697.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161123f26138c2---44864995595.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/92656472493.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/24575045686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+percentage+of+all+workplace+injuries+do+manual+handling+issues+causePDF 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_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C69 16408 bytes
SHA-256: 54dbd55270669bbf2446de0ea3753369a8167cb36ce41fda1137f8b4c355abec
font_02_sfnt_off000146f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F1 11468 bytes
SHA-256: 99c4ca4a95a8c91e81eeaaca031b2a0ae1e14bf140c37aa468d750869bec9842

Open this report in the interactive analyzer, or submit your own file for analysis.