Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db3cf451a21cb1e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 22:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 238ead09f3352303209ddd669c3d48c9 SHA-1: 77b1fbb6c4b36688fd956b28044835147d26f607 SHA-256: 5db3cf451a21cb1e5a54ebba82927b1f6fc2e3363b2484ebd9346184df48eaf0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains, likely for phishing or malware distribution. The embedded URLs and the PDF structure strongly suggest a tactic of luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/2979381593.pdf In PDF document text
    • http://gtlmarinefuel.com/userfiles/file/bidiside.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1627634913.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/didofolevanogik.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/bataramofavidusukiduz.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/97509837838.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/78921884908.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/77026625749.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ke7g8shb9re46d5dodnot4oml2/kimowow.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/rufamowup.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a4341a08430f9be2ee81640cf34de176/21172091910.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/lmcsr57gjpkfqulkp3sh3j11v0/rapozulosunanin.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/xatitomipuwibamoge.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/jojovimavigode.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/gerokidagaf.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084dac68f7c3---lonomuxonukelixufori.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a5e30fbd9---mosadixododasiwiwo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba91207f334---meterolebufuto.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/62444410310.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rugaxavexujevevos.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/vexatuvader.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b6ca8fdee6d5a85d0e37550e85e7dc8b/77002630.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/lql871r2fl6v5v3at6qoh6fqj0/gopiliditanuda.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/50920120553.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dec0f9ff1bb6a8bd4866062406317568/kadefezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=stardew+valley+crack+androidPDF 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_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 10628 bytes
SHA-256: 0ec19f38d17214cc3f9f74a95e8dd4addad145acfcfb47e12655dfd4aff6ee47
font_01_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 18260 bytes
SHA-256: c30aa37ba35bb78f5a0e950046613416796fd2e6bc776b814f58f24abd73d90b

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