Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b35274ad6ed1ec1…

MALICIOUS

PDF

95.3 KB Created: 2021-08-10 13:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b3f30c6fbbbfc8204e9ea225378183f SHA-1: b7bb57908fa1e99bed97b57342ed7efbd316a0ad SHA-256: 2b35274ad6ed1ec1ed8d1bcc24c3ab492e098a1f45f7ccd2149ac6d16b4f0b41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, hosting numerous URLs that point to compromised WordPress upload directories and other potentially malicious sites. The presence of multiple external URIs and the hosting on compromised infrastructure strongly suggests an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/toe2dc3eopp1vsiv3kmcpo0h63/64313227801.pdf In PDF document text
    • http://wawa757.com/uploads/files/27980931150.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0d58a473b---94677681100.pdfIn PDF document text
    • http://soupworld.de/upload/file/59346653589.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/taxadatanovimujo.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/jibazilobelopibevafi.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/tojupadodosi.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/58226254134.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/lisow.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d591ab91e---tezek.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/53452993695.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/48695283186.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738f7331c5e---58122793981.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a73ea937b4e---juzigejuzomonolaf.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/81693469854.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a014276dd9b---zukidaxevinebuputus.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ada83d5420e---60554376877.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/dazubesodavatirazuniv.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/pejakadekawutoj.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/kovaxoxosulavikirifoti.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/mjilip9960asvv2jf710trfn60/1696813625.pdfIn PDF document text
    • https://eurotig.ro/file/12230317484.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/2ac38d4c112d2b1c0399d1dc0929298c/21274972847.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/gazalatalawewusakaned.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe4cd82c60---sirik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fm+radio+apk+without+internet+philippinesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CE 16180 bytes
SHA-256: e05c03e169afc1e6b0fb2ca3fe6571fb755b480113bf5719278c91c51f26cb4d
font_02_sfnt_off00012869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12869 17660 bytes
SHA-256: d9066180d9044cffd457e51b11cc0b2ef92888bf345f8b5b0bb1b038222b56de
font_03_sfnt_off00015627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15627 10912 bytes
SHA-256: 17b4fd0b3b94859a23319c5831479b841d335cb99b6a1c48dc7d7243c39b7552

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