Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7bc7ecdcdcc178…

MALICIOUS

PDF

77.5 KB Created: 2021-09-27 13:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: af99e934780e3cf268931493b3adbb4b SHA-1: ac02bb60068f66aa2b7c37fb60140eb4971fc5c9 SHA-256: 8e7bc7ecdcdcc178ee2aaf68ae32179517ad978762ddc293671769dc032e21a4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised CMS upload storage, suggesting it functions as a link farm for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://himalmanpower.com/ckfinder/userfiles/files/xowago.pdf In PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131543b476f9---89252474318.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7b7b2fb71---49535352291.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615122d853cd0---84099455120.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/89970790240.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/42886088726.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/98603553294.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/kafobetelesezoxelugi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q01e745jecdi7hj6niag10ouc0/taminosexidulolikol.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140d235c2c04---72059400507.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/liruvubako.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/xavez.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/movezilerugikafomotejexef.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/2831732446.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/wakivubomujurider.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/68084551840.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/97694200495.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/11005715061.pdfIn PDF document text
    • http://tabletopad.com/images/file/26815054255.pdfIn PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/68227322303.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/tigexu.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/tepudepewurirupowinovo.pdfIn PDF document text
    • https://kapefashion.com/files/files/70269483820.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149ccd54bc1e---21509797530.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/poditaxefinesodegekazare.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/dipuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=gta+sa+mobile+downloadPDF 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_off0000c2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F1 20504 bytes
SHA-256: c577a0fd30f98cc5402ef6c6832c2b316e62ff2f3b98259f1ecfc23bd3d66c20
font_01_sfnt_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 10572 bytes
SHA-256: e8e439c58b36b890b275316729bdfb6059b7df71f1fbd503d4c8de370fb2b4af
font_02_sfnt_off0001109c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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