Malicious PDF — malware analysis report

Static analysis result for SHA-256 7977549231aacbf0…

MALICIOUS

PDF

69.9 KB Created: 2021-10-02 09:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70910f300845d25a639d5dccdca6aa53 SHA-1: 734683195492c42cca2288da63e864e13cdc12e7 SHA-256: 7977549231aacbf00de55458150bc7ff16f36b0ea8105d389e4b1290c5c01734
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting it's part of a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=diverticulitis+and+sepsis PDF link annotation
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6dad2bd06---43303233891.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b40506b39---35386536107.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021919530313806.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/51565999519.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/49f9b2f479a9f5f64eb1208bb9c3aca8/8743235740.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/jenegaseredasugusejobifu.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/nekepoledojixumubekadis.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/teperipiwe.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/febisevafogetudujopawufi.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/96281331027.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615650b5290a4---xekeseraxeniwepuguso.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///11211359397.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/1855401320.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/78841018576.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/138be2bbe38ce971dbc18ab7198af421.pdfIn PDF document text
    • http://www.polni.si/Images/files/27216653562.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/nopemovoken.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/14067698048.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/78974949438.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/dagetujilulilol.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/zeluke.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/72572674118.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/22968614834.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_off0000b2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AC 15256 bytes
SHA-256: 829473efcd824243de2e83b1b428a2a13f8afdb0e7544b06d814eb181607641b
font_01_sfnt_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 10556 bytes
SHA-256: 61b2447d81631e2369038f976c343ae1b94c8e1d8eb7c8a0af2c88ecd62721d9

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