Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7bd50428bf146cc…

MALICIOUS

PDF

87.6 KB Created: 2021-09-20 19:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 99583cefd2491c5ab8760e067865cf51 SHA-1: ab83077d9520f3fba5f36509990288046b784d1b SHA-256: f7bd50428bf146cc73251380593eccb327330225c615f6de958f07f28cfb4253
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://arichaindia.com/userfiles/file/gonozeberadip.pdf In PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1aa29a303---jafavevabo.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/jodijejodop.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/52118191692.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/wamamijaninug.pdfIn PDF document text
    • http://cochemical.com/upload/files/zubanugavunuvusulaponuref.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/fesuv.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/67739937585.pdfIn PDF document text
    • https://superlitefan.com/uploads/files/xenunesotunevetozejake.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/38895267735.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/99433624134.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/55090997444.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e976a35dc8---jasokurip.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/125f6c8bc35eb233f45ef598ec564853/pirenazetupubujedena.pdfIn PDF document text
    • http://palami.by/images/file/petodig.pdfIn PDF document text
    • http://tipiland.net/upload/file/34817392659.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/32865364890.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/39954261869.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/diwugisuromofobu.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144424266d3d---55885751927.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/juvijalivemalafulumadem.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/faduwixegejuwesam.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/lomofimokokadonedud.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161344d520a361---30826814713.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/30398459603.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/vewigisinofujozojagef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=control+android+device+from+another+android+devicePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 10668 bytes
SHA-256: 5040233506decf184d86ac52a2b351d6e39b6680f8764d7741dc0766a3fc5553
font_01_sfnt_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 17540 bytes
SHA-256: 59136e297a57fecf47ab40eaafc96a7c5f9746e34d392b59d26d13a3e55876d6
font_02_sfnt_off0001386e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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