Malicious PDF — malware analysis report

Static analysis result for SHA-256 921c89fbc20851b8…

MALICIOUS

PDF

84.5 KB Created: 2021-08-26 13:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aabe84c78dbdf57cc5642199fca6853a SHA-1: 7d2e61a72875c785984da07d2a644ea896f43047 SHA-256: 921c89fbc20851b89ea68c93fe56faacac6961d8585075418986a6cd25f8ca20
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting malicious files. The presence of JavaScript actions and the ML classifier's high confidence score indicate malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment, suggesting the document is designed to deliver a phishing payload or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b4fa71e1a---zaxorexamoranuv.pdf In PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/df5421b79d11ffc6079d42afbe5c7e01/47033829314.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/zuwibamovawikitok.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/f86ecf96a3293756c5f08674aeefc226/wivedigunidagi.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/mugije.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609617c2c596b---11482000646.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/xuvelokokam.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/ravimewusurarato.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/48720856925.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/15749668475.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/969c6bee0514c15358ed98907935db04/13699583919.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/afab0b9d3305eed93c98164cff52290f/49333602420.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jijuwofurogiwepewebit.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/cqv31mla93snn6h0ql16a7n1a5/49580770911.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zazopezawi.pdfIn PDF document text
    • http://biomehl.com/images/content/files/49365295955.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/54276496388.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/83384689483.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/30314371724.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/67164190780.pdfIn PDF document text
    • https://chptravel.ir/data/file/30304177758.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/tijaxinazazimetufuw.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e05b427d51---fikipezopimodofobuni.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb477e906b3---fekexovizamep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=according+to+me+english+is+easier+than+mathsPDF 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_off0000e366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE366 17444 bytes
SHA-256: 230f1814fc62e58ee5f5309cbf0388f235963056973563d4e54d47001c489a6f
font_01_sfnt_off00011112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11112 10796 bytes
SHA-256: e907ed14077f7df6ffe4bde7fdbe1d845f48f9d63af54c5e47be5d6987929110
font_02_sfnt_off0001298e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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