Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8b9afaeb675e68…

MALICIOUS

PDF

87.1 KB Created: 2021-09-01 19:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 35e91978290f0f976239d61b7536d105 SHA-1: c4892a9ddf09bcb5b1c5f2a814eebbf85fa552c0 SHA-256: 6b8b9afaeb675e689c2facfa80899406bd4c6f4da218bfea87c553487ee2ad94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/0ef90b8e45f35418b3195d2f5dfa709f/demagumekobuwukulapalajig.pdf In PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074567c5046b---kedefamefepawip.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/19718049958.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/ruvejuzokofapedovumozof.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dce37088c---49047167574.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e38d79766---1318113071.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/94090614866.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/fetonotedotowozimolan.pdfIn PDF document text
    • http://skisun.it/userfiles/files/figazubebi.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/38649024328.pdfIn PDF document text
    • http://atek-ent.com/upload/file/vogoratijevexi.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/tajolor.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/233d8f039076da82ca46a18821bc17b2/33888354109.pdfIn PDF document text
    • http://classtool.info/upload/files/77302126027.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/h806rfted7nme18cr8f8ns1gg2/nepowezu.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/41d47a8b74c5ab52545add81d55067f1/feboxosoneka.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1ca2e742e---rawalajepunera.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/guwep.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/95849455425.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/nuzuvuxisasofusatewotolog.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a16ab449f0---luxomibefoferigili.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/i86pmnj1cln7tv7dhgeqdmq6i1/nivufaxafi.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/72634581112.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/pemufesesoduwoz.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/11943269363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+download+fortnite+on+your+laptopPDF 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_off0000edd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 10612 bytes
SHA-256: 83411e3e9a1e8bd48f2bd922af86ab5ed2a43000716df200c29a672603d64e4d
font_01_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 18000 bytes
SHA-256: 37cc13962b0a9aa871ce4c32d23a8cfd68d9dfb50fc12f5fa4b867b3e5483d08
font_02_sfnt_off00013544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1