Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1317d96f9bfef7…

MALICIOUS

PDF

93.8 KB Created: 2021-07-31 10:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c688a8b13e6a76f0737a68c8b62c91e SHA-1: a38e5cf41d29f9aa07cd931724e4dd5097e6a98c SHA-256: dc1317d96f9bfef780a75759ae01f571648f6f0b9c78166aa92fbfd353e05150
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to lead users to phishing or malware distribution sites, likely leveraging spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://nomylo.ru/uplcv?utm_term=netflix+on+android+tv+9 PDF link annotation
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ee06dd09cd0a843535f2b8046d432cfd/newabebuzukapagekumuve.pdfIn PDF document text
    • https://steammining.com/userfiles/file/tolabediwedikerur.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/somonof.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/82211727093.pdfIn PDF document text
    • http://poolprotektor.com/userfiles/file/10028798243.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/vumopokulanuruxopopewotif.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/70285387667.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/91545144087.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/2dbf6d188dcf85c380922fe0475f65d9/78238912824.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f998100707efdb742d1ba25a9b02d2cc/ginotigerinofiliginugutob.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210731150903.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/75588363978.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/5377500893.pdfIn PDF document text
    • http://sjhtractor.com/d/files/manabo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608089f90ea41---63264129517.pdfIn PDF document text
    • https://anjingliar.com/contents//files/bokevi.pdfIn PDF document text
    • https://edusfera.pl/upload/file/lukelawebiped.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/fegoniruto.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/92757680200.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/18147046927.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/xuvufavarezuro.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0809750c2---jujokasab.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/97621584260.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdda6c1572---ripelozinogefalosuwes.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/vexajo.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_off00010ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB7 17872 bytes
SHA-256: f3413844a8269eb1f6554183cb9c02c72ca81539f59bf2328f5518c3a00210c4
font_01_sfnt_off00013889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A0 10492 bytes
SHA-256: 918562b707dfd7092dd295d8917244556a2239c41396258c0e225854471d3ba5

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