Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ace45ed154d178…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 23:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88c611b3703907a2830a7f36b7117e20 SHA-1: 2c1448a3881b1da243595e8b09fbe69bd52c4854 SHA-256: e7ace45ed154d17885ab2c9da088b7815274e48edd45b12ca1f704ef7f42177d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, including compromised WordPress sites and disposable hosting, which host other PDF files. This pattern is indicative of a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users into downloading further malicious content.

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://aa-nusd.jp/defikivejuw.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/t1d5r0va13f9c6ummv00h0fpdf/57892326288.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/60812056641.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/28520361734.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1437d2f20---suvamewuwuxix.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/rimuronalofove.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/zoxevebivasero.pdfIn PDF document text
    • http://elitacasa.it/images/file/zawaxidorofobatek.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6a1ce71c1fd1fbedc1bfe6324e88ac9c/6550187406.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956350b1200---wojedugezawuzujesijijuv.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/2ac8c9c5635d53664005f24d6c84eed1/53861896035.pdfIn PDF document text
    • http://maxbrio.kr/files/files/96644474243.pdfIn PDF document text
    • http://topflexsports.com/uploads/pudigul.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/zovilip.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/vupokaletol.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/pezewuginineb.pdfIn PDF document text
    • https://aaaxxion.info/images/file/tawataxikuridumuginikovig.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210528_CF6DA9FB12E69C5F.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f6bddf4a5---kajovimafebaboxufe.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ba5dfa37b3d9c1b085289f757a64e928/88913165026.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/sarojujebuvolos.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c8c85dbcb---42548990187.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bad599861f7---kotokuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=doen%C3%A7a+de+crohn+dietoterapia+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_off0000d099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD099 10704 bytes
SHA-256: 277a0cd1a3bc0fc81be6bd79f8ae6bb337acb1c9daa6d099e970d47e4960f181
font_01_sfnt_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 20024 bytes
SHA-256: 9746f96a9ecb88c5b8c343dbf0bbee521a82c99e83654246db8077fc159a0b94
font_02_sfnt_off00011a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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