Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c03a81b4467d3a…

MALICIOUS

PDF

97.1 KB Created: 2021-08-08 00:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2d3fb339accc02dc2ac48588c5a47182 SHA-1: 39f0aaa47aeb0b24f750d3f650abf2195e8e5241 SHA-256: a0c03a81b4467d3aa7650ddb9d590e2d530a31364616f09eea2dc8ec4e531a37
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the embedded links and the PDF structure suggest it's designed to redirect users to malicious sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://drafthe.ru/uplcv?utm_term=the+sims+4+origin+product+code+crack PDF link annotation
    • https://airbays.com/userfiles/file/rejovomasigupoparo.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/xefisakasunexigu.pdfIn PDF document text
    • http://bougerpourstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/kazinoxeveganaseguro.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/r7i8fo0asd82b8ri3ltenp00b2/73876924457.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b61928c435259f021a5546361d9c7ade/zetomanasatinaze.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/1232573723.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/22891963965.pdfIn PDF document text
    • https://lasanisports.com/files/zigifubag.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae478cadbe1---sekefajewe.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/91653013321.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/mivit.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/37561016493.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/lupuneluzoridazup.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/70e43cf869be8b7b4a96d67ae1579e2e/lowebozirokijokes.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c454c2fb---vopikebovenosifidagodow.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16083c1a80de3e---lozerofi.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/89533781230.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/6487308821.pdfIn PDF document text
    • http://ukuleleceilidh.ca/clients/860383/File/jedafuzunovapu.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/itql6tsje244c69i5qd6logj9j/59809236954.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/nipekugorefiwukojuvij.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/d31d685b87a2d218f08976e4308ef339/piwofu.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ll6seh9odegs67hfe1ulk0oktt/54353159965.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/ruzemuvejejaperunep.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/12979e4eb9e3d03391fd5c8634964ec6/jefulujuvisotiga.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/57918446077.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/wanoxo.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_off000114be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD5 11148 bytes
SHA-256: 9e505a43b90898400307172f194c2069954c613ed2252dcf7dcfc47afe1404e2
font_02_sfnt_off00014693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14693 17836 bytes
SHA-256: d68a07f1b009f74751f67b73e8e72fe07684a17cc6e0a5480d851a008ce0ffb5

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