Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2b2d190e4f69d1…

MALICIOUS

PDF

75.0 KB Created: 2021-09-02 05:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 42f55612a0187154eaee0953c6ef14d7 SHA-1: 0f77c71bed6ec923972d9cc3094889495eea179e SHA-256: 6a2b2d190e4f69d1fe88a952f52fbea648da22a0bdb953e666bfc77ed2ed5239
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL findings suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://self119.net/upload/userfiles/2021/06/files/210618230131.pdf In PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/k76qs5govg4r01rlidcgvs3h66/50955352266.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/74975926524.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/fujezogepurejagogavudis.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/41opmj5nt7b37r077bmevf2n51/35019175711.pdfIn PDF document text
    • http://andrewclaymonfishing.com/clients/a/a7/a7b0d980ee28df7184f998a87a00dbd5/File/ritusogowibomuwudur.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a407fe5352c---3226074346.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/bivowagojomebiluf.pdfIn PDF document text
    • https://coluer.ir/documents/file/22604044171.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ee701396eadcef45bb83ea72fe61370f/dotufewuzigitilikovi.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/290407299701.pdfIn PDF document text
    • https://xigmatek.com/upload/files/mizalubagitukovipawu.pdfIn PDF document text
    • http://yilip.net/userData/board/file/luvugobojomef.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c1bcca93---20509457484.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/90976400215.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/puparazelulela.pdfIn PDF document text
    • https://petala.gr/userfiles/file/pebaf.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/o2an6n1a6fg4s575ujbjg785s0/gusinekenoluw.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/35898710958.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d773ab3cb670034976150eba85d14668/8785815565.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/47875413922.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/53823073584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=king+air+c90a+for+salePDF 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_off0000c13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13F 17140 bytes
SHA-256: 437427532b9b1c687be03c5fe9f6979853598cb02c1ab562758b476631d4e844
font_01_sfnt_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 10696 bytes
SHA-256: 8ab622a84483d3a48f27b0f58c8cc92e86e6231300377acbcef80c4895bcf059
font_02_sfnt_off0001066a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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