Malicious PDF — malware analysis report

Static analysis result for SHA-256 27db7de93527c0dd…

MALICIOUS

PDF

83.0 KB Created: 2021-05-24 10:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2c57ff18c618133fafe2089e88c49ffd SHA-1: 300377c20efb40fd935aa3fbb9963ac29c9584cc SHA-256: 27db7de93527c0dd862feba624fc462d71fadf0392648b99cd4ea2a18a424540
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1edc3956b---82100462606.pdf In PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a10764110dd---lesasifulolalizewigonevex.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/7f778b269f0137d466ff1c8f3f3a3aed/fuzubibomisobafuk.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/m0mhl5hrb4hi4v57s6o7751ak1/vibuvov.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/b4bb32a602b098d17c69957971bbdcb2/lujeposalazewa.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e6ae55ba11840e4b6ea0ce11114ccc4d/39177396128.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/80166081853.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/togudifegafigobe.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d798d9100---3191781491.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091991d2ec0b---66188422313.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/masevadelalulubidifamav.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/54320fb442af3dfb08f9b693576a59d1/kofam.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2a72933699a9faf16c0e45b2975ad42e/10742450823.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11b499f084---xasawopeju.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1378368fa---rasonapifijoximasobevar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=onde+p+bifide+ecgPDF 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://scripts.sil.org/OFLIn 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_off0000e0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 4572 bytes
SHA-256: c98035b1e4ce533bbc8a8a3cca2e34a3a649936ec5f9bc1cc89c1940a9a28b2a
font_01_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 12584 bytes
SHA-256: 6c5a97c7e583c2ebf080e166dd8ac358fe2225f12bfc3686426dd6264aed3ae8
font_02_sfnt_off00011948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11948 16344 bytes
SHA-256: 6811853800d93a8d08763e61d4913fdaa96264de6c9d87b032da1450d3bbb14e
font_03_sfnt_off00012f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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