Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad132d84e4d2dafb…

MALICIOUS

PDF

86.7 KB Created: 2021-10-12 00:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 56845364b5b1bf2f92e3839a8c74e167 SHA-1: 7b47816ed3fa8012345079e9ebfd96b954e4a086 SHA-256: ad132d84e4d2dafb9b4904a25f367c2d6300327ed92a6ad64bdc52619b32b97e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host 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 https://laborke.ru/uplcv?utm_term=shingles+questions+and+answers PDF link annotation
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419d8e6d514---nigozefagexusotirogad.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/82426941935.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/33423345272.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/43956788972.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/29557913343.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/bogasenoru.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614082bf1299a---37424787660.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/90683189544.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/4jtgajtb1v130sr8nkhgc880pn/64926829785.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/xafomo.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/88102079946.pdfIn PDF document text
    • https://itscebu.com/upload/file/20211003002944.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/piratudikegolu.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/65731065104.pdfIn PDF document text
    • http://gardatrans.com/content/Files/15893599417.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/razipojukeja.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/bazizinokubajulo.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/xijivomeperubag.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_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 10936 bytes
SHA-256: 426aa8bd6c697e8dbc70468ab6dae0a01d6e7e6960b8166a4379c044880ed225
font_01_sfnt_off000101c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C4 19976 bytes
SHA-256: 966252eb08b2bf5c2836c9b08be95070879bda07d9903ca2e273fb94b8e353e2
font_02_sfnt_off0001354d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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