Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bbd5e5bfdc26f3a…

MALICIOUS

PDF

88.0 KB Created: 2021-08-19 08:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 75a32ee7598c543d732c5241b9eb2d0f SHA-1: ad7e109d34c65413d900cc7a5dcd8394b9dec791 SHA-256: 6bbd5e5bfdc26f3ac34b80b915ce0f6663426650f98e403debe81504a92a1cda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://smidgel.ru/uplcv?utm_term=how+to+developer+options+on+samsung PDF link annotation
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3faad0ef3---99048158046.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9e0e72bc38a7800561583786f7b11f90/gasukokofozupufozi.pdfIn PDF document text
    • http://recviem.ru/img/upload/83372081636.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ic8kbah0p4id1do4dl82ss4g4n/34854109037.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16100a7ce3173f---85108811960.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077685483981---popus.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1607a28028843a---4809030490.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ka3ne04ih2t1fcu6bkehh4d5t4/bemuzosopaja.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160705818df5c3---44861778123.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/49021574330.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/75935727961.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/zoxuv.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/a70cbb7234b1b69146a8231b58bf0ce9/watidupogi.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/wiwawisegubixuve.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/dojexofuwexagalabas.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/gosilal.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210603072810.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/wisilulobavanaw.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/2983217700.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/25264218238.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/34mro7tt5astkomb239go8rkv3/51945544206.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/funafumavelidizejasiduve.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1708578976---39917697265.pdfIn PDF document text
    • 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_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 16984 bytes
SHA-256: 5114a82ab96b4131a13a6af06b4f474d7668b4658d062f9d7f439b92e60f26df
font_01_sfnt_off00011fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD1 10976 bytes
SHA-256: 4508e9d878787eeeeda781b6367ea44377761c1e3c1902b188a1092a27b5716f
font_02_sfnt_off00013911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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