Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b25fc4c2cbc0b2e…

MALICIOUS

PDF

93.5 KB Created: 2021-09-01 11:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1bb65994735aca3319fa6d9931ffcac SHA-1: 13a2a34894e9537d5f809fa66d7398b1b1328cb3 SHA-256: 7b25fc4c2cbc0b2ed145f5fe904c5f452e3857691e5776e67a5dc7c743061120
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 CMS uploads and disposable hosting. These URLs are likely intended to lure users into clicking them, potentially leading to further malicious content or downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or link-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bc0f3816f---nububom.pdf In PDF document text
    • http://uniroll.pl/user_images/file/bugakiviwudidison.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/5332697750.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/kunetixozem.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/lavexaku.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/pubazexovipelajoni.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/566d187da660ab62494eb8b9295a5694/nesiniruzaw.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/sezosega.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/goboxiwimoselaboj.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/68a74550dba4758ac65a3e989013614f/89306158604.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/norupirake.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/lijoraragolobetijotuta.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/24372369669.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e4f9cf6a7---mabejirefixadan.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/rugen.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161298e88afa76---vazikodifotowejevivisolap.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210829121858.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/10230daca0b1eea902e7f585735e4f15/6237560828.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a139691616a---zemasopema.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/26766956920.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430211553262708.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/vonud.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c592e21cf52a32e73e96618bb1143faa/bujabegese.pdfIn PDF document text
    • http://strap.sk/uploads/files/tuxotogoxapefadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=c%23+array+findPDF 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_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_01_sfnt_off0001116d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116D 24652 bytes
SHA-256: 3a6be58e02b2293e7eb60fffe62482aa34225a6c0ad0e543b33a7746fac65138
font_02_sfnt_off00015116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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