Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c83ac4a78b6c053…

MALICIOUS

PDF

103.0 KB Created: 2021-08-23 15:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22cfdb74a50e48912660ca8de16506fa SHA-1: 41347d988196f4265735aefd257ae213c8bde5e9 SHA-256: 3c83ac4a78b6c0536981f1aff3a3df8bf00c73545ab23ef0985348673d57cb1b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://ubestsports.com/imager/files/20210805062802.pdf In PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/42qjb0b4sa9aqeuaumiedv9m7n/lagofujoxogutepugurowomab.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec5589667e---38464510106.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/12770493602.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/80d1969b642eb255fc2ba2d535023082/gebivekosafegabog.pdfIn PDF document text
    • http://yanartextil.com/firma/files/motokitorurituwekapogusu.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/32e6bpmb4ku8bvmpcmud6vdjm3/zogijisaxet.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/4831186405.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b613104d2d7---fedaxoluzufimuzanotuluro.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/luminoleposugazova.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/584437d8a5a4c11f2a7d3423e4567aff/warakekerefike.pdfIn PDF document text
    • https://altbuket.ru/files/77932298729.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/31429145069.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fd5747333---nozijorukejivetapi.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16079ccfadf910---53588501113.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2e92d657ed58b12555d048ae35c57e7b/donus.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160823655d3a0d---jozimubiki.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/62399713212.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7121b166f84b7b11f6cd4003772cc205/39561447147.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/10826432231.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adb0f6da4d0---95137442878.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/7885759953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=discourse+as+a+productPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001169e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169E 16752 bytes
SHA-256: 7c1a8eb0b9c23cf203c969b5d5d5631f8eb4ae760335902abb309347e0b2a7e8
font_01_sfnt_off00012e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14644 18036 bytes
SHA-256: 4cdbc1fff4c9fffc02a48679ef7a7e9593635ebba0b82dc7a4a2044c2f049aa9
font_03_sfnt_off000175df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175DF 10460 bytes
SHA-256: 096824877dc49a4f383e1fde5086ec015dde6c4a60505854e85794ba8fade055

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