Malicious PDF — malware analysis report

Static analysis result for SHA-256 43fc8ce44b072715…

MALICIOUS

PDF

113.7 KB Created: 2021-07-04 14:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ab1efd50d87169b078ba9bbea741bf96 SHA-1: ec74156ad196ca05beff29a79115c8105db775fa SHA-256: 43fc8ce44b072715fe526ff85902bbde21074f794936c866e6caf929e949f98f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is likely responsible for initiating these redirects or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

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://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/83dba625ef11d299a8f2b369e3fc1ad3/wotudukewilidefijowozi.pdf In PDF document text
    • http://bijverhoeven.nl/uploads/files/54601791354.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6a6ab95d95e6c5e0f908871dd695db89/34922143598.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cb53b12e3---87000710032.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607be1cb389cc---98513081918.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24f3c8bec---piwirosefesolizosenekeze.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/lugugafolarugafelilebu.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/n4f88diveb8kd2ocabd0on3nqv/mutomet.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/29876078900.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/96606850012.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/79d83d8dc626f6af803f13d4540cbeb0/fuborudunibewep.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/xiwufegirewabinag.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/lowegubutabuvogaweg.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qbc8cc8luvv3cjl06lqq3f5l93/powuwabofozokukitosi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62c1100281---vesifu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/h27ea8qakqhjpusc14hq6fnvk1/sagusakigep.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/japusogowetowonawubivo.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/90480736229.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/55476315902.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ee1d0f2a2---86818588159.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/65f1383a94fd41eba92dca4f7b4412eb/24219788139.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/18397534989.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076361a18dc9---dedinunamos.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/95675722d97faa1f45e875312c7dba2b/16503663103.pdfIn PDF document text
    • http://learningkey.org/userfiles/jomuxoxugekaw.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/jetapejof.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c85448f0a6744ae25c33ce8d70c21b49/bawojadamumixivasoxalosab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=famous+business+strategistsPDF 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_off000149dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149DC 10620 bytes
SHA-256: 04d7683d567321e5e71c969f6d8e8bf332653a44aaf7ddab7c437a9490e259e1
font_01_sfnt_off00016224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16224 19608 bytes
SHA-256: 6faa678de562b15d794ce85015300907171551b9be34971303b80abff4cdc65b
font_02_sfnt_off000195d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195D8 2488 bytes
SHA-256: bd33b1ff87e29c77859dd7d74691990b9c6362c1431203e8d5c7e8260fec7b7b
font_03_sfnt_off0001a09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A09B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1