Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c360136cb49307…

MALICIOUS

PDF

84.8 KB Created: 2021-09-18 18:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c11c126dd136e21ad2fe89ce4b10612e SHA-1: c76a60e647f5348035813692a3ef2b201ca9ac16 SHA-256: a1c360136cb49307a13bb0c35cb10b71deb6e222810ba8758c7c6dbafbb0327c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the link farm suggests it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=changed+game+apk+android PDF link annotation
    • https://nsaimmigration.com/userfiles/file/32152199988.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/287696f8cadc6bbfd1c2f9e36762cb13/lowajatakoki.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/rasiluw.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/60734692171.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9dfbd76bd---23684306743.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210909_125423.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415c97ac8e9---kawizaj.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/54311517452.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/34023849101.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/64249178092.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fddb0f1f8a---65597056141.pdfIn PDF document text
    • https://stotex.rs/files/57361326718.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/94617870927.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/79495660557.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/jamidiranaxetabepaletelid.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/89158646297.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/zesasu.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/xesomekugikupopupo.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/zepovaku.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/78669101596.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab868c2186---miweweselub.pdfIn PDF document text
    • http://www.centralperdana.com/file/18929365043.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/rozadokibunimuxasub.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a07486e59---fagodozumasufemaseras.pdfIn PDF document text
    • http://glttek.com/userfiles/file/34926820309.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_off0000e790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 10648 bytes
SHA-256: bcb12b39f4b73ef51babde3e3d9bad512aecf504dd3eefce4759b842a41afd23
font_01_sfnt_off0000ff78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001178a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178A 18040 bytes
SHA-256: 88c1aa6412b377059793b31f64d1c45933c4e19b085da7d0f99e6ebf90794da7

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