Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e12bc5e2eee9a7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 22:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eae1157c444f15df6c064d5d051a039c SHA-1: 1df481fef9e70dad6f68bc3bab96f26b4c5c03a1 SHA-256: 25e12bc5e2eee9a74e94975abe0794d6d30f780b4063f9e83ad033af85984dbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files, indicating a link farm designed to redirect users to malicious content. The `wkhtmltopdf` metadata suggests it was generated by a tool, potentially to obscure its origin or purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/b29c4ec2c685156c07e2d69613fd0375/38069555403.pdf In PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161243309e62a5---33969679931.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/2ff3d7af98978e08495790689e062fc8/fexitemasajugifadimijarej.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/u4avskbdreo1mv1n8n5ipglvc3/revuv.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/49931875180.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/aa7ad5ab359c51adb627b6cee4ebdd15/50668703150.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/90688955438.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608082bebb90b---63433372083.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/tuwevumarokomekijas.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/25124647571.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160969f2e5a2df---dopavoranenut.pdfIn PDF document text
    • http://precisao.org/files/files/lanuxopaturemub.pdfIn PDF document text
    • https://x-software.cz/data/file/53820781230.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/bopofumukafaluxebezatujij.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/riwugeru.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b539aed23---sawikigepawufu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f19f1ab684f---75531286662.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/8471489628.pdfIn PDF document text
    • http://beiks.info/public/file/tidurera.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/85685480679.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/12635008344.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/99640972748.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/491aa0a62f00e46154c48219682365f4/sixutalem.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/1vanlflvdciu7hk6f07o69h280/xasizulaxafew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=disc+profile+assessment+free+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_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 17032 bytes
SHA-256: 9715f276be8b599338e800eb741d2a3d750d8a54d856fbbcc323dc92ac407fdf
font_01_sfnt_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 10780 bytes
SHA-256: 7a367e2d1fbdf7f452be2e4149782cd5868dc25ef2d29c6bab2e139030cb7fea
font_02_sfnt_off00011b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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