Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab45f59cabeed1f…

MALICIOUS

PDF

90.3 KB Created: 2021-07-02 15:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d5ed78725c9116f2f00c236bd029e509 SHA-1: 609068f878065bc0223816ef0be7c075a1679810 SHA-256: aab45f59cabeed1f2c824361cc388a9b6e6478c6cb4bd2fc28176d4e092358c7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=find+extreme+values+of+a+function PDF link annotation
    • https://europartner2.pl/uploads/30867916440.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/remiwusomep.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804135ad759---55117456899.pdfIn PDF document text
    • https://computerzone.pk/file/92153713829.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3ba85ebf3---sapotozesavoririti.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/kedog.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/8300664471.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/7981561558.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/15274457249.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/viponeped.pdfIn PDF document text
    • http://zae.me/datafiles/file/pigovepabitam.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dada2dcf45---pepejen.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf02623d4c1---zurufib.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/ij3lrl0tqc508ns5pnafug6kt0/tapemiwafagevezebiwev.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/27676052190.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92c8c38c30---66458529288.pdfIn PDF document text
    • https://susta.vn/userfiles/file/fofosimuveligij.pdfIn PDF document text
    • https://atrax.hr/files/lorogozoxisesuni.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/tolezevalikitisoxudevo.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3b82cceb---xazutofas.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/zamepubade.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/32474069645.pdfIn PDF document text
    • https://netpage.info/userfiles/file/vuxurugatapewubuwosuvirej.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_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11647 10880 bytes
SHA-256: 0b679d486fbd375ecf0de0f1d5979fb4ebcd9a52901a2d055f0c7371e11b3873
font_02_sfnt_off00012f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6F 17000 bytes
SHA-256: 581d575b150d3087b7456b6c4d2080b332634c4c3682350c030add8b52064127

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