Malicious PDF — malware analysis report

Static analysis result for SHA-256 654b193be45fcbfd…

MALICIOUS

PDF

92.6 KB Created: 2021-09-07 17:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30fbfbddc96a832851305b477651cb9e SHA-1: e36f70286663aa0ee43c28d405a358baf3243578 SHA-256: 654b193be45fcbfd2ff84927f95b498b4a601aa1eff195e6d4b1b339b66683ca
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the idea that the PDF is designed to trick users into clicking links that likely lead to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://minipowerpack.net/upload/files/78682045503.pdf In PDF document text
    • http://www.niziointerior.pl/upload/file/74568866620.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbb1d7bc86---zatenewu.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/tulol.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b12b3eb87373c4b46e4a584d583e6565/refikekajege.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/80fe208b68b83fcee34425d1d248da26/pijoler.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4d432d796---saxegifimivagizafamadixa.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/3793699846.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rupanasumoravusa.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/53b7d00848faed6e7506706321e0c288/fizupojugebidexurasulif.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/batupajotijovitajibovu.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/92572717381.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/fe7884d38199d251810430f49b77e33d/99286892709.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/veviforosexe.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/59155683690.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3d6e5b3883daf4b8bb4a46c47a024727/kaxaxaxasimudelap.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/41250475909.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/71838966038.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16089d3b360a77---tirifolojokinapabovo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2eccc4e8---72135748130.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/87331811929.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a59f8ec78c0---62787374826.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089145d18a06---32386605569.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/zapesenixixatenejogeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ug+nx+training+material+filetype+pdfPDF 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_off0000fe37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11649 20392 bytes
SHA-256: 651cd9d8c3316c938344cff7d688299c1a7d9ba66e2b90ecc6cb94fec4952327
font_02_sfnt_off00014c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C65 10776 bytes
SHA-256: de742d247fe561f28fe845a6a681f246d72d1464ff9f9507f887eab8fd5f40bc

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