Malicious PDF — malware analysis report

Static analysis result for SHA-256 8497ece25e2b4cd1…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 03:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 870bea01c1763efd4f675f71236ed284 SHA-1: 6a02143568666ea8e8521023dcb527352f6a973a SHA-256: 8497ece25e2b4cd14ceff901d1d7cffff06a3d34a73f5c643188e9f011171780
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as link farms pointing to other PDF files. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and a 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristic strongly suggests a malicious intent to distribute further content or phish users. The embedded JavaScript, while not directly actionable due to obfuscation, is a common component in PDF-based attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 http://aallergy.friend-match.com/upload/files/82968839328.pdf In PDF document text
    • http://carnow.jp/js/upload/files/doragosimopiviket.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/supomiwukegejofeki.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/zukewosapagez.pdfIn PDF document text
    • http://devveb.net/userfiles/file/padibezed.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/37475345657.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/jemavogiweridoweguforoli.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c36705780---pigubozadigitijomuna.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4b2b22e5033900aa39a2c3ff4d8099e4/bemokimalodavoxafogakaba.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/39204555372.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/55533969205.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/67864257140.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/54106767613.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/18814606564.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/22285991568.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/3068822768.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/tofojumuwawutidunogom.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/304705810adb284405205d187a657509/lewirofewodowapamokewu.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/nuxugixafelufimuves.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/21522567210.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/64340317078.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/befejejuloxogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=spectroid+app+androidPDF 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_off0000d4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 18008 bytes
SHA-256: 94786f345abacc6e1a0e0fc36db25149830fe85fafe4c67837967eb722d84cb4
font_02_sfnt_off00011b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8F 10368 bytes
SHA-256: 31a50819e25645fe912c9edec2584937572db2c5e099f772027175e906568e18

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