Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6db84b390ed8b18…

MALICIOUS

PDF

93.6 KB Created: 2021-08-23 09:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea77d575db8495ac8a6ee675853dfca6 SHA-1: 469a0c477cb3dbf857041ddbec0476ac8528369c SHA-256: c6db84b390ed8b18ec3e8ce06c5975ad0c48f704adb808f8be0ccb67085d50c0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, many of which host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and compromised CMS uploads suggests an effort to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://netmode.net/app/webroot/uploads/files/40165081557.pdf In PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/pasafekusuxobi.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a4361ee24---julorizu.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/29817266773.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/eom6te6te42d4qji3u4veo7g42/4949420080.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b88cab3f78---jawilitinozutaki.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/73177022931.pdfIn PDF document text
    • http://abc-tel.ru/data/File/govowa.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b3b20d79b700a602797ecf0b455133af/zogiwej.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607765f6e97df---zimuvexegamofawij.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/2v2b2tno5kbgqjnnoebd1pe905/lilabudavomazawes.pdfIn PDF document text
    • https://nasikampung.info/contents//files/fagofezukizuwurebes.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c741197fb66---sefedafalid.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/25201336938.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/271557467397.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/petelalep.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021053005300349.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45b27ceaa3---xavoraxifitalokin.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608390a107bc3---fopifize.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161115e34b56a0---kigiwezudexowowowi.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/jfkuu896n0k39jv717hkkr8h71/zutuku.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160965a67ad77a---dijumofitezikudawe.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/1ou04l7tlsrqh9408o8ear2cll/59874072290.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/b77361a5292db8b844b58b4fb682fa5e/5112029379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=learn+to+swim+level+2+lesson+planPDF 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_off00010946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10946 10640 bytes
SHA-256: eb901d618bbe8cfbe452cbaa0e3a0c73f4d8a33522953405822ef4e596222f7c
font_01_sfnt_off000121b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CA 17248 bytes
SHA-256: 63b0013fd4a0c24152043317c9c3812bde8193d36feb9eb23d5f9efc3cb40dcc

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