Malicious PDF — malware analysis report

Static analysis result for SHA-256 09749a46e3462722…

MALICIOUS

PDF

91.0 KB Created: 2021-09-07 09:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db885a7c1e0a7ef9d6cdb14923a4cb89 SHA-1: 1bb891d2c6e62c5fb2212459748d8fb8bf49e635 SHA-256: 09749a46e346272265918e9e333acc4c474b5ee93f09bd01341e9cd5beff4650
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=che+guevara+libros+pdf PDF link annotation
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9fe2e7d8---95362421263.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/kobodexibuxifafebodi.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/73854269478.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/dadusikemamafiwamataxot.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/40849557371.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/zutoboluretipeno.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a694233d29f---gevirokewife.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c9a69ccb1---lebififujozikolomovuw.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f4262cad96c0d1d0f29e3fe4b34e990b/55665934779.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/6504301444.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/61031552959.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/14592428581.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/57f11c7511cf884192482b906f4198bd/lilemogupemigamijis.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/xuvozojibi.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/24535e69441961a60cff1a806c1ff321/93228630196.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/lukafenorixaxalibojigu.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ed38a586f9b6b23084f00047beaab343/wogerorejotivumibikinag.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/86ae4b387b9a0e67e6a7030bc499fa96/dajejumedoko.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf2c97b14b---71020119950.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085aaa4a1543---89675329813.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/detukedejifoximexopo.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/jokapajulub.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/80397497766.pdfIn PDF document text
    • 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_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 10912 bytes
SHA-256: 088156fd2fd55546259372cebf22f73c533f8913dfe1834a7784ed22ac83b4e5
font_01_sfnt_off00011593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 19096 bytes
SHA-256: ea48ff6f939314d4a9edcc8f7b8338a8c4469c4905641bd56af7879f7a2a6ae8
font_02_sfnt_off00014674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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