Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5544b3ee888b917…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 21:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 88f9b1e460b00dfefd83154e45feac17 SHA-1: f7a0519cb496fa97a9f996e9758973f394e0ee33 SHA-256: d5544b3ee888b9177f74c585f791071c2c754c38d79bb490bc2062aee0f7a84b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains or compromised websites. These links are designed to lure users into downloading potentially unwanted or malicious software, as indicated by the 'subway surfers game download' search term in one of the URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://synerhu.ru/uplcv?utm_term=subway+surfers+game+download+for+pc+windows+7+64+bit+free PDF link annotation
    • http://news-hk.net/uploadfile/file///52456542381.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/kumividafumubinebux.pdfIn PDF document text
    • https://polytex.de/sites/default/files/18993102168.pdfIn PDF document text
    • http://allycatering.com/userfiles/95559942197.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/mugexurefudonipuzozize.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/74092944148.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/5697217376.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/regepakuzobupufugiti.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141a00a7ce27---7610008029.pdfIn PDF document text
    • http://forti.in/userfiles/file/jabigotekugomu.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/bcf788ff45a13f965b5130934666cf76/xipupevekilowowefikuwado.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f0b7719f7---vidofufakoja.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/kurakitirexiperudelijis.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/47119807032.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/83139606978.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/kevabubimamisesof.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/meselekoba.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/795627100.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/39948491363.pdfIn PDF document text
    • http://precisao.net/files/files/refakar.pdfIn PDF document text
    • http://floramarble.com/uploads/kazat.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16307705878455.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/58503213160.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/podatufalamo.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/xivepuxugajewijijomilibub.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_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 11772 bytes
SHA-256: f8f7f52713ac7ec3dd44842af1650ce21a089fb0e61f6876e62b584beb8b8a1a
font_01_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 17372 bytes
SHA-256: 586dc8051847a4de0508b454a6ec9a688fb851363456cc6151ac82bdeb22b10f
font_02_sfnt_off000124a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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