Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fc696854e75d23…

MALICIOUS

PDF

109.2 KB Created: 2021-06-30 13:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5f804f7c0ec6b8ffd90621a4c7c557f9 SHA-1: a6f9b9a16b55bf272ea5dc3420298369316ccca8 SHA-256: 10fc696854e75d23ec821a1131ca22aba6ff687ee232cbd8b3fa347d69af3eaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URI heuristics and link farm indicators suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://smidgel.ru/uplcv?utm_term=brittany+brees+naked PDF link annotation
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/49419594292.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/wininunuj.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/dlfj6tlhutt2g8rf428s0kl06i/pedavuko.pdfIn PDF document text
    • https://artenika.pl/fck/file/gewemikawizowidobodeb.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/sumimipa.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/wemeji.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/u5gccvnjhtun10bqd532a5m1ub/gumasekupusojav.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5d13c5f1d3a645353fd3c8913e9d0018/redelerexizorojimaxujita.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf71ad586---2828057826.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ebf3b3d61a8f832767dc3adad5af3ea/11415063568.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1aecda2c2---93741051231.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/mawokenidalinutajip.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/kamudibitabuzuwuk.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815490bbd70---jidonipixekopafuwewivot.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/21892467988.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/826ea4c44ee0b642c30bf7e19f55ba54/mewajavi.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0e605c9386479d754d7d034c0c669989/dobowenapipapururudu.pdfIn PDF document text
    • https://rcot.org/userfiles/file/tubisadewojewakozanuru.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c2694a654b0d9b36687d2001edb73a79/vopasafesumuf.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/91439706971.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e4a6310c6---22592023673.pdfIn PDF document text
    • http://altinay-law.com/images/file/45315731467.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/rk9a979e70g7lmsohuq8ppumm8/wejinigu.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/sofepatisexerukevarutok.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2f138a612fe0fffe9ce8f944b77f4402/77019834844.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_off000144f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D02 18548 bytes
SHA-256: 7e0fd706b6099152da756a54aa0450046f153ddad8536932bf3f897ecaacfeec
font_02_sfnt_off00018d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D40 10476 bytes
SHA-256: 471feaba8cb65f50a81e9f101d34aa367243180c0c9493acd30b698df4966444

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