Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70a52c6d90cac5f…

MALICIOUS

PDF

87.3 KB Created: 2021-07-13 12:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6a7c2f0da4db3dc70b69679e820d99ab SHA-1: 9150deb5b451f1430cbc9a88f95f80fb2c343973 SHA-256: c70a52c6d90cac5fbdd4d349060a0184891948d86cc31ad144ce9b7d68661bde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. These links likely serve as redirects to phishing pages or malware download sites. No scripts were extracted, but the presence of embedded URLs and the link farm structure strongly suggest a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bc-arman.kz/ckfinder/userfiles/files/mowododa.pdf In PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/be406077fc6889e59f665e99eeb2664e/karijap.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/xirevanas.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210504075315128.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/d6cd485ffc68d56ad09da4f4ba270f86/bopavativopapukuk.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/mexidove.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899c55a2e2c---93732589904.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a9aa4ed0cc59bcea0d380440cfc8feff/toxuvasive.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/53c5d4d60196a1d9a11c7f4f0332a208/38766917644.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/sajonubedabotuxome.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/nimavejetomovelemi.pdfIn PDF document text
    • http://motelandratecuci.ro/userfiles/file/tojawokumofajize.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/bikitodovarub.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/77e3fka2mv0uii5s1jttu66p9q/84970464338.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/1ibqif1ogd6l2hjv7m34uqsn4o/84812370996.pdfIn PDF document text
    • http://primaneighbors.com/userimages/wivumizuvoraguvoliweb.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/48083019153.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/v30udaji8osci6bbjacvd8403p/gudoko.pdfIn PDF document text
    • http://schokobrunnen.com/idata/81182350170.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e54b97c44---vidonafod.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607158e70ba12---88876033480.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/riremubaf.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaea9e9cf4---sirumuzi.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b0bd5ca9ff66b86428b7e587524991be/bofosewewetamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=solution+of+relation+and+function+class+11PDF 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_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10792 10696 bytes
SHA-256: 2c98c6b8194237ae6bfafe0b202a89eaf0ae40585032183cd81c802a37ba7d00
font_02_sfnt_off00012038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 17812 bytes
SHA-256: 908f5a8c8ce612217838c6c44f68f547f2d56a872676ce920ecca3e86e7dd5ce

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