Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7726994f2cb2b7…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 02:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c6f6e5739921b93e5dc979a35ca23199 SHA-1: 75c535b969316880de483e22565a07d78d0f7769 SHA-256: 8e7726994f2cb2b798ccaf966435467293159548fc664d770448b14588a17a74
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

Heuristics 5

  • 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://queure.ru/uplcv?utm_term=one+circular+face+and+one+vertex PDF link annotation
    • http://samafb.org/uploadfilefiles/pudunometibubix.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/29a59b007c8f12a9bea2752e9d39ebf7/7678750018.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/motog.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6ae54471e---pubinigowogexuxaron.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/76895448393.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/b0435e841a31212fa4d40940a7d3fe16/21489470811.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/1q939u6odhu96b4cufafhq7o4o/55378313049.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/66967958474.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/89307801960.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/53436348146.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/8gied9m8727rh4qmuip6ni59s3/34251192850.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/fq96h26067qvt301q76qhebar7/bifonavifidojixijepiwivo.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d0be0652c1f4fadcf5aef48d9dbf25b3/74284524748.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/25481300834.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f142be0b2e---46402088669.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079626aeb7a8---78270442343.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecfbda670e---60588779264.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abe95aa7cf5---53343595361.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/39fda5efe5b90ced67afc32b79bc9d9f/lipunepo.pdfIn PDF document text
    • http://immopolignano.lu/images/33026486012.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/d8d082e8997121ba53e92692f64739d2/91166936692.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/lonuzulalizejujeg.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/10985044788.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/qpfas1u17pt7ua3sdvp5699sm8/mezurowe.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/bcaa6e9ca5e745fd53e7bbba5383bc61/zidaminawelimakekiza.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/a811d1ad2f5261a2f48341a881d24608/dusebevo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cd7b559d497acb2084db7c558fcc90a7/buzitewopomifi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 16496 bytes
SHA-256: 57e1aa6657db76a3fb027c69806197e39c7a112db82b36936ddd77cba0b0be14
font_02_sfnt_off000119c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C0 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off00012fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA1 10592 bytes
SHA-256: 05473067b694496d3fec18d21d8994111da3d8db5e954cc2ab522f5706c19c35

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