Malicious PDF — malware analysis report

Static analysis result for SHA-256 91578f2776bf8dba…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 06:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9a544e4060288b6745ca78d8942e105c SHA-1: a280706f28b21ebc05919b9d2f448920a7d08676 SHA-256: 91578f2776bf8dbaf45373d3f85b42b617dd8d728803d9f92700cd595896d557
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting. These links are designed to redirect users to potentially malicious content, exploiting the user's trust in the document's apparent content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mobspace.xyz/web/img/podborky/files/polebikoluvateperud.pdf In PDF document text
    • http://danieldesignpro.com/userfiles/91965595395.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16125622927138---64173456428.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6937dabd256e237074988b69d4b9d092/92551826985.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b32d7ef03---gexuvifepudumonu.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/vubakasodunoxer.pdfIn PDF document text
    • http://dmhfamilyreunion.com/clients/4/44/44eff64e497b984d8b2945277059c9c0/File/wotarudomosenakarix.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/mimonisabuvop.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/gopezobavinekozuza.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/2fsq8crdkkjudm6v2ldf0pgf57/98337108347.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e780ee6c9ce---86892686969.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/93211145532.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/e6hu1eednbhoekf60nj2ok8o11/91319882888.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/39768433679.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/c37d45529f3ecd7e203eecc7e744e386/ropepojosapo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160beb77a25548---nozekomirakexavaku.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/suxizijusikugas.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/zaxobemejebawido.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/74713695118.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/59448106916.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c72dcf7a26be7f22727f6be1b9723c21/15943373064.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/dugumusaretelulur.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/betuwifidaxatedapilewola.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/60d75c3d205da0d516610cb510f59982/xavosukuxemuvexami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=advancing+formative+assessment+in+every+classroom+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_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 11124 bytes
SHA-256: 5d297db4a29b7790d459623b1af5035216b39299ea677709ef8b1917f65dc297
font_01_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 17636 bytes
SHA-256: cf46646b0261f9157f1adb41ccc973d7b80f674d3f01619d6c6d4c88527596df
font_02_sfnt_off000122fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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