Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7285443b0a1b554…

MALICIOUS

PDF

93.0 KB Created: 2021-08-18 23:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fbc2e29a59d9603f077b235446496499 SHA-1: 381d4c51af3ddcad21a63fc6f05c2fe54d93acab SHA-256: f7285443b0a1b554e8d668eb0845b3f8a45467f7b1e1addbe1d27b2b4a041b09
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.vandiestbrandstoffen.be/uploads/files/18981678295.pdf In PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/wijitubigawapafidiz.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df3b32855c6---lopobej.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/xejureduxixasuxuxofe.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/91f555fb43744577f1df66c7872f8ccc/tujonuxik.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2a0f6463548cd4dec86ee549a923448b/lodevuwutowidukitafowetem.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/wolidakofezu.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/33729079962.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0cfb3ec50---fidajof.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/peles.pdfIn PDF document text
    • http://ud2-140.com/files/76865566792.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/duderutopiwopoj.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/wonuro.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ddedb1e6285d24d400993cf8134d3514/32698051565.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/58606551313.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078db398ac75---zezuxofupax.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160729562e7c03---36536248879.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffe1fc367e---71386406339.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/67i04imvqmjngspdv6e0ankcbj/30160017210.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/mozoxumeweriwimamog.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160972018127c3---jewanumasatilimuvubera.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/42148694161.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/31527187312.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/nilejamowisudewotup.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/73233323279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+make+debtors+reconciliationPDF 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
stream_006_off000114f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x114F5 18324 bytes
SHA-256: 5d252e24ffccbb1b78af0459b48519c34e859d22e1aa34ed709d9c4fd480f24f
font_00_sfnt_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 17676 bytes
SHA-256: feb49715d39016c1e8cf079377d796637518a2ea5a99ba4709e447b4d2b62920
font_02_sfnt_off0001323a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A51 10840 bytes
SHA-256: bfb86bcc8f0c743bef50d747b6f0e06aec453b6bbf3ad540a2c7ab247a979602