Malicious PDF — malware analysis report

Static analysis result for SHA-256 b886327a35fc87e1…

MALICIOUS

PDF

77.1 KB Created: 2021-08-27 22:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29c82badc368d72d279d324587d786cc SHA-1: 346e78de5f7d4d592a38ee6996878a33a91e446d SHA-256: b886327a35fc87e186cecd49a2d6bd55ea845ca5eb766be398bc3c3b88d4b67b
156 Risk Score

Malware Insights

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

The PDF document contains a link farm hosted on compromised WordPress upload storage, aiming to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs and heuristic firings point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160703a0bc1e9f---3303772453.pdf In PDF document text
    • https://badoza.net/userfiles/file/gonowotubuxu.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/82449808621.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/sgejnj5md87sps0cvv1pghrpve/70495529299.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/56735013941.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210628174119.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/28239027334.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/53652493882.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/94624119071.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202108050022088854.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/19428993082.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e9720ce02---rixarogo.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/dozer.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/bojilovimepewegofogebe.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/kidimopofu.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/6988810012.pdfIn PDF document text
    • https://wagaskar.com/media/61439427776.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/90041046661.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/99545611789.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/desijigojobowasubodevama.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/32821412416.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/tefijimuximugago.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607681c2b0cb4---32382330994.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f848eedde1---65653970126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mount+pleasant+south+carolina+directionsPDF 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_off0000c8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B7 10704 bytes
SHA-256: 463d849f5499d0453cfda81424320344df5c060315284e9edc0e901dfcb75ca1
font_01_sfnt_off0000e13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 17020 bytes
SHA-256: c7a56b4fa1a1e9b49962bcdab03df40ae9d4f2582f0e6cf52aae25e23b426aee
font_02_sfnt_off00010d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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