Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d7f1c8fda85975…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 19:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86e2b7d5405f365a87452a17600ef430 SHA-1: 4a9bd9b7282f3acba667048ec7eaaec82fad48a7 SHA-256: 25d7f1c8fda85975534267aff0ddcb6080388da2dd964dfa7ef40f3e905c5dd2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, many hosted on domains associated with link farms or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple external links suggests an attempt to distribute payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://srihemkuntsahibfgp.org/hemkunt/userfiles/file/75004041770.pdf In PDF document text
    • http://realloans.com/clients/73966/File/17238733332.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/derofubebokujifosusabim.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cil2gn65hktmmb4i1qcs0ng2m1/zuvirodatenexezok.pdfIn PDF document text
    • https://aildf.in/userfiles/file/78997517011.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcc2f3e010---seserupupuzawu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4d74eb1e8---53241803976.pdfIn PDF document text
    • http://carszana.com/image/upload/File/79391398569.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/tekibalemazalakuzatu.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/55476611878.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/47289639097.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/45665302896.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1611453c05a4fe---75621670703.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/60212803756.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be329e17a67---33521059836.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/mesiwidetenadojatujipav.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/43715920a464942cd31bda7367a80274/dunozukujamutagu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161173ea1d586e---48649346259.pdfIn PDF document text
    • http://chromavials.com/d/files/vaxogituleta.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/97431651309.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/diruxarurijepejuxabufuxo.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40855b6f5---kabaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=american+visa+form+pdfPDF 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_off0000d023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 17900 bytes
SHA-256: eda5698418f54df8154cf7fecb14e1c17b91f19c661766e539066889b8274a52
font_02_sfnt_off0001167e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167E 10684 bytes
SHA-256: 457c81ef471a8305b9e189a350b03fba335e4ec64ac88b38fa5ab1e777a5eb35

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