Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbd5e15f80ccd2b…

MALICIOUS

PDF

95.7 KB Created: 2021-09-06 10:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4ee77b096f3fd7961320572ae75b29d2 SHA-1: f99beca97e6f535ee83b010e1e3cce52dadaf54e SHA-256: dcbd5e15f80ccd2bced8aaa0c2922d48a89f267c2d0f90d5583be05f3e6a85f2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. This suggests an attempt to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studiomarcheluzzo.it/userfiles/files/vatofaluvowifi.pdf In PDF document text
    • https://media-get.com/userfiles/files/68776071363.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210702015858_p1jsfv.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/sukazi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/08opssco0tegon527efahmqqr6/nobobukedurufeniwisejomep.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160974afec10f3---vuvadabexifobonip.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cac165805c3---xalabawabilikesukopeleno.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/41241772056.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074151b350e5---vafogumegegowilalolijom.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071ddddd58a3---fuwutoj.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbecf7face---86356221993.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/73940180049.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/66724828889.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/9c1b426e0a8ea521a7ae6b22e06408c6/pimuropatasuxexagavo.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cd4259dae---dejivebivevexegezurixefi.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aa5396431---poguligew.pdfIn PDF document text
    • http://beiks.info/public/file/wifamewilefufapafutafagor.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/23744138039.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/pefekifepegazafejanixap.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/m9ra7fe3optdid6jfoivfemncg/53792766174.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bca8896a8---42878644434.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/23720866087.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5637b22ae4---mejebopuf.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202108251935121544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=manual+moderno+guatemala+telefonoPDF 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_off00010ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 19616 bytes
SHA-256: a2f3c6da29a8d0a9adb491e70ea90537397e3c6b192c4a11de7d67f17905e21f
font_01_sfnt_off000140c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C4 10528 bytes
SHA-256: 5fbc43c9faceace6267f057a8ecc521f28221eadf7b3228570ffc670fefeb843
font_02_sfnt_off00015883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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