Malicious PDF — malware analysis report

Static analysis result for SHA-256 906733b613af9061…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 03:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1fdb5cff7fcd4974a9fa483d2237d615 SHA-1: 3805e39369a30c0582bc7dad9cc63e7a15efcb0a SHA-256: 906733b613af9061945177e48d732caf3d2eef003040c83b05debaaa4df235ac
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=the+guest+house+2012+watch+online PDF link annotation
    • http://borik.customreal.sk/data/files/bivezijadar.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/lonigunegilalu.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1a10f0247---86825122053.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/37157904241.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/nopapiruk.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/54103843492.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210901/file/folegixapemigajivaza.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/lamogonadi.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4836a8445---gimodirux.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/lededavokularuwubonazar.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/85780439536.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/24672925333.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3291ddc3912f4c337474fd95217d5d57/70198277891.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfde0d4ceb---40370108536.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/fexeraruf.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161457d32ceeb1---33093479918.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/goridegovuvibum.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/jafuk.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/wamojafifopolegepux.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/nilul.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/67142282127.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/lekuxefuwum.pdfIn PDF document text
    • https://svltv.in/userfiles/files/56646950796.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161408c2535e01---2788643766.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_off0000b411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB411 10852 bytes
SHA-256: 7dfe032c5a81fd8e9f6cf1ff6722cf919cbc907caf20df04eeaeee4e6f88d70a
font_01_sfnt_off0000cd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 15584 bytes
SHA-256: 33decda0abd4767407a0b7956034bac6ea0f5d4a00e32365f180396d602fe707

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