Malicious PDF — malware analysis report

Static analysis result for SHA-256 17bccdbbd58ec915…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 20:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eaf128106700f9cb46d369e5f0230391 SHA-1: 93b7c6dea96cd4d28324d9065f25dd41eb7eb2ac SHA-256: 17bccdbbd58ec9153a3aa354c3dd49b6112834528ad6e31ad3c634517287ce3c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this PDF is a link farm, potentially for SEO manipulation or directing users to phishing sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=companies+that+have+used+sweatshops PDF link annotation
    • http://f-kcc.jp/user_data/userfiles/files/tipubodobadoxoduletajuv.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/69190382199.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1631346526935412047.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133b2d423498---popajabopu.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/kewexem.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/fofuraguvokumojolopagefin.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/dotuxizujusizedevekud.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/mulabetij.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210907_034744.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/tilebagufufobetulut.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/raxatokuwomuxo.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/1413775871.pdfIn PDF document text
    • http://marketingnews.fr/images/file/7311367829.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/zalirenibipujenabesawez.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/810b810f0fedbd6f31c6ab7d37c9ac66/50000947102.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-13/20210913211547187007.pdfIn PDF document text
    • https://dalba.net/other_files/File/35093391657.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/tubojetumusesanekor.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/71027580949.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/4157174818.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613081845a430---25592419366.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/57587794397.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fatatavikedasizemajovewuv.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/rijakonujiwinudu.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_off0000d3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD5 18548 bytes
SHA-256: f1477e668d55c11c603c3633660a317f4978bd340e374a5c65c95646204532df
font_02_sfnt_off00011c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 10792 bytes
SHA-256: f48b4a8d757dac66ef7de54b8a6379347bf61bd5d20d4501b60b36b71034d465