Malicious PDF — malware analysis report

Static analysis result for SHA-256 0179974567f9af53…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 22:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe7a69a2eb8f14e2bd7995d36df983fc SHA-1: de7fe45efccdb90fd44ef52190e1a7be895b791a SHA-256: 0179974567f9af531d5c9f90480f5da635b1abe93c6816c7b3b473b34d80515b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the classification of this PDF as a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=never+alone+ki+edition+apk PDF link annotation
    • http://yourbuilding.ru/userfiles/files/6928805318.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/munexisoroxidew.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/wufofolegejoburasewiz.pdfIn PDF document text
    • http://logicamail.it/draft/media/pukulumik.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba2345fe0---nilul.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/51651024858.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/gotan.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/33358462340.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/10353334514.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0bac0101d---15754428824.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/raxeruxonoko.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/89612676542.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/zaxorulukikulokaxagu.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/worokep.pdfIn PDF document text
    • http://watch62.ru/files/files/zituwofilugerupejuvik.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/pujofutak.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210910_002447.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/zoridiwizobapodixaji.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109130208525916.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/waban.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/daguki.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/253534bfff933fbdbb620212d30be42a/kububuzipozi.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/91163849689.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jenef.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f63183f61d---pifobonit.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/wigoxidanekelu.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_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 19140 bytes
SHA-256: 45691d237d351c2005a8713f879efb8411c3db5604a75b159ab89e7aaa161eb6
font_01_sfnt_off000118af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C6 10352 bytes
SHA-256: a81c7a834a2ae7aefb05326e5bc2ee11fa8c4377d15c016c80c73397c7ef5c68