Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2fe553962413b0…

MALICIOUS

PDF

86.9 KB Created: 2021-06-25 21:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ce3633167294efa07603757f4b8f0337 SHA-1: fde6031f307239bbba38dcb50871f7c2ae100f55 SHA-256: 0a2fe553962413b08fee5dcc8d026005f3ecf6319dcbf89aa86b9350e48cfa92
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studiobaldizzone.com/userfiles/files/xuvenusukuzapisitoliki.pdf In PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/21a544834d163408ab09489e0e1bfad4/12506660868.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9b02e44d---56671682070.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077c6c0b80d0---danebifozibu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/719cfd1a6f5d04baf3631cfbd1ec302b/zifosofonulakon.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c45e9435---44983127144.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/xigojagox.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c8c00e77dd0bc0822c324a93fa1991db/11171489216.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/655b8695433b1a80f19c0ce556decb34/kuzexoraleruta.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d18f20065---bepajekugobidegumi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/24i1n24nenkr3hu9tc0hjf6hm1/30380415090.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/2fab694f665e4a7239c54aabb34bd620/zekojuvivuxijedevatuku.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/vamazeni.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/8809b8b84d7351b7d20d88285666e1af/lijigufuduvona.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68754849425.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2156ecd19---newuzefofod.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607785d0dfa19---2211231468.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16215915181224.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/j4h6rbdela9d5etvqn6kovsib5/govimumipimetuwikuwim.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210618_2DE93A4537E68A84.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea041a7f1c---busufiv.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16093de7c74b20---96639170688.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fafc9e13a58b58bd2ebf4b2a57d27a8a/xaxumulivakumisukaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=bob+dylan+one+more+coffeePDF 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_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 17256 bytes
SHA-256: 615ed55fbaed90abdffec5a0066cad21b1067af195bfdb67b4beeeab603194bf
font_01_sfnt_off00011e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4F 10584 bytes
SHA-256: ab59c659e87da2e8b7149cee927b25ca1686c8537f8848c5bbb5046528ba2680
font_02_sfnt_off0001367f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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