Malicious PDF — malware analysis report

Static analysis result for SHA-256 879e3faabdfb8716…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 07:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3aeb461c6f4c87be854bd5b029938ba0 SHA-1: 110e3d6ea585503d208fc38d94434308f8f631f7 SHA-256: 879e3faabdfb8716bd745500040ef493222d093fa492c3e5b4639b8036e73d74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fuzoku-kyujin.jp/ckfinder/userfiles/files/15202854428.pdf In PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/69365325949.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6sp48eoo110sk73bkdpb3l1rc7/1252967744.pdfIn PDF document text
    • http://www.asslar.de/downloads/suwozemegavujusaralor.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae04eaea03---48962876529.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/sanuposolikebu.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/48a0fbc340daad174f532eba04f65300/wiranimetakijubuvip.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/5188679514.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/43536180344.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/sejafisanimuxis.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/83515639163.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada22ecfc4f---97801085822.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/67873029750.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7ea8cfc1e3dc5edb6800849686ff05c3/72938579913.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098235e42630---bofinap.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/3595e8b60e144e6186065ad3296d67d2/darupibisimimuwez.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/20217301350238530.pdfIn PDF document text
    • http://chinahongji.com/d/files/nelusuva.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/70573925127.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/korarateninimavaduj.pdfIn PDF document text
    • http://thaide.org/userfiles/file/17407096952.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021061002090373499.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/91362102749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=lg+ericsson+user+manualPDF 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_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 10532 bytes
SHA-256: 7d5cdd958996ea42a9b6a63637da9e3f0548084a48b80f7db9ebd3a5c57e617c
font_01_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 17180 bytes
SHA-256: ba77eb7c3f6bc1c184fff3e52883c9e9cf0d3d4396c5f16b62fbd3a46be30d96
font_02_sfnt_off000123f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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