Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1205db53a8ffcff…

MALICIOUS

PDF

95.1 KB Created: 2021-08-06 05:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 339ab72f552282624a8e3473d3d9265c SHA-1: 1293b03a06bb1ba9f7f291bc75c78e26aa71905f SHA-256: d1205db53a8ffcff9e0c7f0ecae329925858028665b06860ac08ae83eb0e7122
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://crewmak.ru/uplcv?utm_term=how+to+do+a+squat+properly+with+weights PDF link annotation
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/adf546659d6680e9d2c92993fad2b2fe/xifizaruluzegamojaxewa.pdfIn PDF document text
    • http://thedreams.cz/files/162759912.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a24f0861f---jegolanatuzobosexaritabe.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa771043eea---jaxeganonegud.pdfIn PDF document text
    • http://greenbrier101.com/userimages/wogozezubabanugotu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b3443eef8da1534235384acf6390b048/82974437431.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/zufewiposimimuruxapavopow.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/61432919719.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/fuwobugedarabuwoxoka.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/pofesufaritumu.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/waguvejaxepoju.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8dbb044c1e876970cec513f8a744be1a/vusakulegivopu.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/13167941128.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5f25d2e5d71b178d21399df80ad4faf8/tadojuxudagufo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13be1a0cfe---tigupujike.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/17911329584.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/benur.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b93a3a1d1---govadakofavedemiwev.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/74594193297.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/senofukagasameriredozege.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/99524818121.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/vibubaforinin.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/70463241514.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7333a5314---26493924527.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/21471299325.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/8822550473.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_off00010e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9C 11004 bytes
SHA-256: 6b9f1cfc8270c028ee33262f5aa7b373368d7317f88b5f12a4fe9c8d4cd1d857
font_01_sfnt_off000127d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D3 17544 bytes
SHA-256: 3d6cacedef7f248a165eabde973bebfcf02b3f23e828231d79d456f659c727dc
font_02_sfnt_off000154cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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