Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8ad2d69c23734b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 02:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2865877b9b0ba1f143a65ddb0ce391c SHA-1: c01d9acff6e7005d7761e00cebf8a06f95c3a9ac SHA-256: 0b8ad2d69c23734b40dc1b4cfb2e671bab48d16b5b1f96c8980a9dfb5627f09e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories. The heuristics indicate a link farm designed to redirect users, potentially for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613026edf1956---3815949894.pdf
    • http://kraemer-duennebacke.de/files/file/sevubefoze.pdf
    • https://scmsgroup.org/ckfinder/userfiles/files/3402034347.pdf
    • http://lhdrum.com/User_File/UpFile/file/20210908145717_OTcxMzE4NDk5Nzc=.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b88395d19fdfe85c4088b7788e784bda/savogevipoburima.pdf
    • https://remini.hu/userfiles/file/butirijegoxovevoza.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130442817eab---22596206310.pdf
    • http://hiroshima-teishaku.com/userfiles/file/mobavufesi.pdf
    • http://haenuri.net/ckupload/files/wevizi.pdf
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/75580908184.pdf
    • https://aluminiosarla.com/userfiles_arla/files/dusidudesusawojimelez.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8e9026b9---jibodebiguruf.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e40d681e0---rodatu.pdf
    • http://apsons.eu/files/file/4257425867.pdf
    • http://ingmarcofaedi.com/userfiles/files/fonanisajuvopajisidoj.pdf
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/91351214248.pdf
    • https://sdhouse.info/ckfinder/userfiles/files/bozevudutedagar.pdf
    • http://shopgraeagle.com/ckeditor/uploads/files/94342997357.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/849445d798a3de689a5967a0d2cd1c5e/85801365054.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aeda2ebc4---69637966338.pdf
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/wegelarupirisijuninidiw.pdf
    • https://powermailer.in/userfiles/file/69790073892.pdf
    • http://wildzipper.com/clients/wildzipper/userfiles/file/kiwawoxijuronu.pdf
    • http://www.amedna.com/userfiles/files/46165935706.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/ledamirupelikasinanomu.pdf
    • https://s-oil.hoakhanh.vn/uploads/image/files/wenatotelomad.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=iphone+se+2020+bd+price
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 16792 bytes
font_01_sfnt_off0000f566.bin
c9a810c78a95c9d6709394147d2947885457c84309060f4b0ea9b072596a744d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 10640 bytes
font_02_sfnt_off00010d6c.bin
b61bf585a7c5925779a020a438d765314f98d4d670d00db7074791b2a1fa4d5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 18432 bytes