Malicious PDF — malware analysis report

Static analysis result for SHA-256 901331e73e16de55…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 01:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c0d107fbfbfa7a17e342492de97fab7 SHA-1: 43c1f1acdfa606ef9d3e3e6da47f01066004c16c SHA-256: 901331e73e16de55693ebba297e1db519b6b29bbed41b9dcb97d1c22463f1604
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with spearphishing attachments used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=theism+and+humanism+pdf PDF link annotation
    • http://colescastle.com/clients/875019/File/69001934396.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/melezabafabexopogodeg.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/losuzirexarabaj.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/tenidumezovobobikepu.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/jemof.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608585263a4de---jidemopevelasaxekizek.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/13049141254.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210802_9598B9F5C3A2CFC2.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/51832954228.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0e6ec37af---41054500357.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/xomejid.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-08-12/images/files/12198633210.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/500b77b4d43c029ec65040d5c42d036f/mopavesizet.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/1dc4ba75d10bae5d5c491a552d2dfa66/77876607697.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a10b5be42c2---patotixizipitozuto.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fea7ccca36---nogezoxeronoleviju.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/5m632d5nah8n8qq1tp0t2miqt6/vasurugox.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d7eff3ode6okj2ej4b5dofjpv/wuwenuxavadaxakemejesovom.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/6a400c88a546273e48cf3c31ac4ae90f/tijefalofikupufaxobalu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3624b63dabe6b162a5e80642d69a7e1c/44867799537.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/99052089699.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf06ed9c0---3193191337.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/ponowifenujakikorem.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_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 10464 bytes
SHA-256: be4845667ca69e2b3d7300cd59232b27698819399dc768ad490b0bb9714a3cbc
font_02_sfnt_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 18264 bytes
SHA-256: 03d1e7a6c8b6ab8c449cbe9b1558365cc3cb5b3b09cbd1591753da21f939feec

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