Malicious PDF — malware analysis report

Static analysis result for SHA-256 da59f07eaa88ec46…

MALICIOUS

PDF

106.4 KB Created: 2021-06-27 19:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f1189c5dbdd4dfd2eb91fb7f68889c4 SHA-1: bd35ef241a0dc2b5a790e7617f2ea93fc95b6d8e SHA-256: da59f07eaa88ec469d1569f8c73bbad30517e9df31ce2bd331f091b652491cdc
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple compromised websites, likely intended to trick the user into downloading a password-protected archive. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF link farm heuristics supports this. No scripts were extracted, but the overall pattern suggests a downloader or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/50962dd84c80250b681cd5c3f6ef71c2/jazine.pdf In PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/51165177460ecae0f65ac0c301866ec8/simezokariji.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/jerubed.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/3845482505.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/bsg9r0992grgfegsl8p9ke9020/23151849287.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///43910588460.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/82299946448668a7a1b21adf06593ffe/wasuviwifisefufabosarog.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c9cd3fe8---tuvax.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c833191437---xuzukenug.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a59b0bb6c8a---49614275596.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb41efad73a---51154324174.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/8f9ef79a40fb367f58ab2d47e72f44a5/19043004402.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/boposerisopawivaxovus.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d62241fd01e8fc9a80729e334f7aa97e/39349353320.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160779a8e6aab1---poluwelev.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb45ac29e4---39379031920.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/15047233041.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/22517ae667c2eb9a187104abc8ae9f01/riguvodifibokexilorage.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/d79taqkdlodej4g833861fsl1l/24995878169.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a17cf6b48568a48f724e704dac5f57a2/65506498445.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/84420826299.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/76853367975.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5903d1a7c6---42533615550.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bff08ec1e19---7651886982.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085c26966863---kedimalofidobijoduxelot.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/zifonesonizaninupipofuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=volley+post+jsonPDF 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_off00013c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C88 10104 bytes
SHA-256: 1d85ed6f1092fc55fb6ad1d0b5817524e8abe31c5fbb7665f650b8ee68122adb
font_01_sfnt_off00015348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15348 18476 bytes
SHA-256: 05cc1e038a20fdba769302aa58af1a5a91ee2709290bab9c23bb3762da2a8e60
font_02_sfnt_off00018489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1