Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b4b8c5e514d780…

MALICIOUS

PDF

69.9 KB Created: 2021-09-16 06:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 439d4dc59d8b9986f3c91de72ade303d SHA-1: 6cb38a9b0276d7913d2219bd1ce51aadb67daa35 SHA-256: 20b4b8c5e514d7809e8349c5b9eb0de37e4fb3afb2e429fce438cc5e100581e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://inwebjor.ru/uplcv?utm_term=advantages+of+key+informant+interviews PDF link annotation
    • http://kondicionery-lubertsy.ru/upload_picture/file/52672864430.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/67482881349.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/17115600161.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/tuvokuk.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210909_32CDFA60C51DBFF7.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109080130347299.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-10/20210910135323695753.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/77567216423.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/retijutawagetibepawirubov.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/48655628992.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/12329419468.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/17864046810.pdfIn PDF document text
    • http://18554080.com/userfiles/file/15742876576.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/61756800819.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/11662468959.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/e86fee8b13c6669e0361391b37bc5bac/97832117683.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/63443952648.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/xomiburup.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613264e497284---97189101624.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/7499322988.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b275a15f0---69607693816.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/kanelugadilaruzujut.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/wuvelufa.pdfIn PDF document text
    • 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_off0000b3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCB 10988 bytes
SHA-256: 8c5e2466fdf44ae0854fd1dab56ddce70fef861852defc2040b07d9dc707f2c1
font_02_sfnt_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 14448 bytes
SHA-256: c83d80f7fc1903551889580f46bb183669f37af41b7580cd4c1eb834648d5dda

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