Malicious PDF — malware analysis report

Static analysis result for SHA-256 e243370e61880c68…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 18:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 639e2288249a5316f96de2364990b8e4 SHA-1: d8c45e91d5f7cb2ef65ee9c7151fd74e3073be85 SHA-256: e243370e61880c687eb242d113ede3907ae18476477a364edeb415de8dea2053
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to lure users into downloading further malware or engaging in phishing. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to manipulate search engine results or user traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://quatanggiabao.com/images/uploads/files/42666559858.pdf In PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54a5a6419---63031655618.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5eb8bdf123---pitugabekelananaz.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d39108098ae---84316807983.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/53345980627.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1ae8d7c2---66409529866.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/lizagasar.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/23420737430.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/28441820199.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/83439154362.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b24c140df6a---50967413658.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f03176a3---32466718513.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd1747031---kewomirova.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/kakujiwu.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/zadebinopedaramatovo.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210830090703.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39df1e0516---kegodoku.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/pebexijekosulodakamesa.pdfIn PDF document text
    • http://ubest.ru/images/file/vibezi.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16252374781890467596.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/7570469c6886da8ffb32c79ae3fb52ef/55382428546.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/wisekelotanamugazeliri.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/zubilebibi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f5f135ec6---gikegerowi.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/73980458645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=guitar+fretboard+diagram+pdfPDF 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_off0000d749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 17660 bytes
SHA-256: b75715c0009ae09d5db108b4c6df54cda81d68bd4d9a9df0f0d51e3d7c66e9c0
font_02_sfnt_off00011cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF0 10804 bytes
SHA-256: 1fe345a8b69f80256826491cc02827a0e053e6031bed11a160bd28bddaf8d575

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