Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ab1e659ec42b12…

MALICIOUS

PDF

83.5 KB Created: 2021-09-11 23:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97b48257c4ebb6e42bd617b6d1a5d423 SHA-1: f8c3f8463735d083727b8331c8626965acf9fc10 SHA-256: a8ab1e659ec42b12bc0cd8b9ad2d3ba9e3745de03055dff6974b3c4e8dfe0957
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous external URIs, with several pointing to compromised WordPress upload directories. The presence of these links suggests the document is designed to lure users to potentially malicious websites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pistant.ru/uplcv?utm_term=anime+live+wallpaper+desktop PDF link annotation
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b544d262cd---12377716244.pdfIn PDF document text
    • http://metallpress.info/files/kuwanomafadet.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/zifezoburoluxopi.pdfIn PDF document text
    • http://infosierra.es/images/editor/jexif.pdfIn PDF document text
    • https://hssanesteban.cl/files/berutaxej.pdfIn PDF document text
    • http://glassick.com/userfiles/file/73133259796.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/50845412652.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe717e7edf---6502565141.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/51529129512.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/vifodatabodonolajunoxojun.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/58289435506.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/fcf823954ed682acdac23c8e0b8f7c96/lipidulim.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/zetife.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/pinirivilumor.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1bbfa3ac6---bogasilafebarawapizi.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/27225430030.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/watuxozesijopafoba.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/84433094735.pdfIn PDF document text
    • http://rinsacars.com/files/others/zilizadezobew.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/salefoluvesisexodumuzixan.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/kupajufipuzigemoxaperifa.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/wozemuka.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/90089943401.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/58d7f413a9e7ab7d4e85120057efdc7f/bamimuwejoziga.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210908155254.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/60796537191.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_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 10780 bytes
SHA-256: 5769ecd2e45ece96abf547de8f6edc6ececdf7ce2e389e75455b176c5b901425
font_01_sfnt_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 17604 bytes
SHA-256: 90a6af5befe7e6a3a5bbf0ba9e896dcfffe7e0e6154dc772699aa43a5775d2ec
font_02_sfnt_off000127d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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