Malicious PDF — malware analysis report

Static analysis result for SHA-256 038919d325bf6679…

MALICIOUS

PDF

84.9 KB Created: 2021-09-14 23:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3960752cb26d451c3749106e059de258 SHA-1: e8e36ed3f506ffb84080618e8648f5595b52bdab SHA-256: 038919d325bf667939c870052f1b544834dcf6db0aab2ae46673fbafb6032c76
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and utilize disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://almondzwealth.com/administrator/imagetemp/file/xobiwilu.pdf In PDF document text
    • http://currycornersugarland.com/admin/images/file/zosogomutijovovaka.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/65743115109.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/lovufavakabefag.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/93208959930.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/62950224563.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140223ae7266---71396068096.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/59434976193.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/95877752205.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f9573382b---bevozezilizod.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c22e8b2b3---pixagutudujuxasiniroxese.pdfIn PDF document text
    • https://robertbah.si/files/file/digufunerutevoseko.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3fcc15a2---tajeropapad.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/tobakenogu.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/23516646362.pdfIn PDF document text
    • http://analhospital.net/file/files/fazorenirepizasomam.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161353c7d0f83f---47605115313.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/limerejubuxa.pdfIn PDF document text
    • http://wwsm-us.com/files/file/sagebumok.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff997b98c9---27218060718.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/57562620963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bt+yahoo+android+appPDF 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_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 10308 bytes
SHA-256: 53dfa80e3b0b1020397e4e03e53c20770db4927ca0a8ca9ee8c24ec9d255089d
font_01_sfnt_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 18056 bytes
SHA-256: 34fc07a0573b7a69353f873e43517534b68e582dd18673e45f4efd6ae9cc75f2
font_02_sfnt_off00012e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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