Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb3db6f6b6ff0e7…

MALICIOUS

PDF

91.5 KB Created: 2021-07-07 09:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 427755221db9ddeccad988bd33f8a4ba SHA-1: 1d96dd3a631672cd1912de1c3a28dba55befcb50 SHA-256: cfb3db6f6b6ff0e721447d2855094861b7c0480488268accc5e1096bd197ce1c
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, likely serving as a distribution point for further malicious content or phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b3ed93b5---wadoladakogotemavoj.pdf In PDF document text
    • https://nguyenhungstone.com/uploads/image/files/60449016816.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/cd1faccb9ad1987687a87e70e92adb5c/12111807300.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-28/20210628230336145597.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10c48f3bd---saxuvamumilojenuwep.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd1ada0ea7---33842510617.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a250becbf---72563201208.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/7a32be323aebbe86350af088b466c887/20083077986.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/40554791329.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb2fe1f6d---99770846242.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a500eacbdd.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca234215268---dukavuwuripoj.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ed577a22b---57352535344.pdfIn PDF document text
    • https://hgb.se/filer/file/mafunujuzokomisumopibome.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/62135513018.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/ac4907082d38bea9a0d5e1f0ba5fe46f/lopolukesimamimufi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c82ceda0a1---35538733481.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/42098124425.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0d23b7bf4---juwuba.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a3a8d7a0a---kiwalopananatefokux.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a06fae06e---35542084698.pdfIn PDF document text
    • https://securitydm.com/slicice/file/2226188054.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/25de3fa47b6ef4e2ecc1e7d50ef4718c/bajulupadotezem.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/83038622953.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/10549815523.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad7e6250e---jatupuvitudokubepixa.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b126589e682---lomowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+fire+protection+in+minecraftPDF 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_off0000ff65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 18460 bytes
SHA-256: c036f088a598878e8ae266616fa690938187ba06182dbb198f278c34f4bcb16d
font_02_sfnt_off00014863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14863 10692 bytes
SHA-256: d1bb02f87310f5a101af20f5819c7349a970d27f6aff7f4c94254ec314f65c0d

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