Malicious PDF — malware analysis report

Static analysis result for SHA-256 59262faa92453b3e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 15:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc1020ef82defc359384119e00d776fb SHA-1: 80090e65cbdff5c0d695d4f1677ee88399383cdc SHA-256: 59262faa92453b3e2a9548b2c6472099737e81bd228ebfcdefdcec7139009e60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://cructi.ru/uplcv?utm_term=remove+snapchat+face+filter PDF link annotation
    • http://krevue.cz/UserFiles/File/87282145365.pdfIn PDF document text
    • http://askaudit.ru/price/76936707008.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b6247c23f---98431434253.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/11218562714.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/fodubekedasitobinowitamo.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/dapokupalezifupusubo.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/lunilimadizuwunibisut.pdfIn PDF document text
    • http://storemisr.com/uploads/files/34054504850.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/buvasigokiribokubezo.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/tudeleguvokugo.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/65822208879.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/lolezewitugilabeweluli.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/fapetilevivifelizabur.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/zukisagevimugu.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/nalmctomdlens0j1hdtk01r6tf/sozowipulukowilakide.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/vorudodanaroraxapelo.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/debowemug.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/degedijinotij.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219132247248375.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/83012989297.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/21508946022.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/88458466000.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/793a6nhu0anupr29qa24dlb8j4/71497567339.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/tajuzawutaperesarux.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/80725822049.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/66698a457f01b4f8516a74e000f2d872/gididise.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/futafumivoloram.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_off0000d905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 17872 bytes
SHA-256: e58f30284d99575a69cdb3388c9e40d263fe9d1be2f58e2bb36e229865d5c147
font_01_sfnt_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 10856 bytes
SHA-256: 014318e7ee61108f589a8f7daecbbc91e9575a8d37bed01702282494c51c9cc7
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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