Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e19a3e4cc6f15d0…

MALICIOUS

PDF

94.6 KB Created: 2021-09-10 09:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc9576726ba07aa6a5f99804f9a270db SHA-1: 5df8c6e360d40cb551519a8c2d520365af3e3e11 SHA-256: 1e19a3e4cc6f15d0b1387e7b0391e249b699b7fcddaa32df08497a34d7ee8b6d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, characteristic of a link farm designed to redirect users. The presence of a link farm suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://e-park.es/img/uploads/files/jipofebefiravuxukowa.pdf In PDF document text
    • http://red-persimmons.com/upfiles/editor/files/89200330234.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/xurefi.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/mokozejetoxebodono.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318bbc6b1a1---12161200135.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae395e5aba---sasesitizovuz.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/tudazomafowoluson.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/63422676802.pdfIn PDF document text
    • https://suksesunited.com/contents/files/lunalaji.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210901231306_wmyn2c.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613595c8c2b50---48272107528.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/56955225044.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/tuxunovakalar.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/54586195644.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/wuruwelolo.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/remopazemobovaluxefo.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/64402023915.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/guxukovobafuzojekotiwape.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/pilirevobofumiwiraf.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/89230099486.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/49988992881.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/pelen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bloxburg+houses+for+salePDF 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_off000107aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AA 20340 bytes
SHA-256: 8f14a884eaa40be53c3d580af42a8ca54867cd722bbed8b73b0221e2e53b5243
font_01_sfnt_off00013cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E1 10592 bytes
SHA-256: 6212929c7cce820b01bf0954898a1d5be814ae6cbb9f8255ec1d2f2c72f1aa92