Malicious PDF — malware analysis report

Static analysis result for SHA-256 c019761a091f9f86…

MALICIOUS

PDF

99.8 KB Created: 2021-07-15 21:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8864c77f494cbfd3444567508ece48d7 SHA-1: 53a725c2ecbc64ed68ea831fd6d4b972b8059d23 SHA-256: c019761a091f9f86d9a8899df73b6e84bcc52a5c71046136eb214e85b969e59d
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to multiple compromised WordPress sites. These sites, in turn, host further PDF files, indicating a multi-stage distribution or phishing campaign. The presence of numerous external links and the detection of a 'Phishing.Trojan' by ClamAV strongly suggest a malicious intent, likely to lure users into downloading further malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ffacb170c---54594192686.pdf In PDF document text
    • http://circuitoinsulargc.com/documentos/file/85881729656.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///14367424678.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c521cef3f1---rusadojoxefedumunadewatav.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/53097577429.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ef561a5b6---piruxiluromodew.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b36b98d5f---mixotabufaz.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/40477309611.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/63762476973.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb37dcd2b---kixuvuwedixapalamesa.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b1729640e---89668366848.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac6b2e2762---wasavete.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160923edc0d705---medobiginuvigopawimeda.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/8c7d8d15a6fb19b2f22fc32c512338cc/koneviradit.pdfIn PDF document text
    • http://liyangah.com/Upload/file/ruledaxiradaxogidi.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/88395944635.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9de67c37---kezevimekixek.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c84f4432944---mewemitenefo.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/466fc4b8f71168e83abd565de21b15df/46798274714.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ccmj1v5ag1gurqu3be8vgmk4mr/rumaguredetel.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ec0ac224c42aa910735684a83931c9be/20298513798.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/08226af5bcde5ea009c58e1afab7c014/98509774771.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ce1siuvdcv6ats0a62tq2qf3q5/40834815857.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/314c297p09db37k6mc1failiqq/61567002358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=meaning+of+nialPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010582.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10582 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001231f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231F 22888 bytes
SHA-256: 00b89db0f6c0bf7e8032bedbc0a17a213857c7e50fd27793c16f6fcfe6f24b9d
font_03_sfnt_off00015c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C47 10016 bytes
SHA-256: 1cc540ee06bdc5bb42d32ca8e267f5afd14c8916a17793d4add8209a587c39d8
font_04_sfnt_off0001728b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1728B 3784 bytes
SHA-256: b69b0f0f493ef9a96028b33c3ce1d68d406c13cfc54a68091053bf8145d2da5f

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