Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb331ffca4ad65d7…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 19:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6c4a8f01c0c7b1b1f4367f77ee99e425 SHA-1: 32dba4f28c3f5986030f6cea4e66c1b252a9ef99 SHA-256: bb331ffca4ad65d75cf1b3386617a0f02149ddd0623683d862736fc9c461ab7c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of 'utm_term' parameters suggests a phishing or SEO-based lure. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of it being used for malicious purposes such as distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=among+us+mod+android+hack PDF link annotation
    • http://cinebuzz.be/uploads/userfiles/files/21921049550.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a33acc4ff---palafidezizunaneronutujo.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/tetugonavugenozolo.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/11916518100.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/sikavubo.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/maregokeregugode.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/10959888589.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/kalujixepedajawajapapun.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/68434339989.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/78388087195.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/24140592004.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/94853606784.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/wexodajufokif.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/desef.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/seroromav.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f772804f41---giweturexebeku.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/jonijekixafejo.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161300447de192---gixunasefuruwuvalelin.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/84767534549.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/sediv.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/6d6e35725ccbb823144d31f06df433dd/puzoziruj.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/velesupi.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/kiragopuxetasaziki.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/mulenedogemafuwexesu.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/52610975740.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_off0000eaad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAD 17532 bytes
SHA-256: 596af34c96f5cf13838ae65665de6dd984f41dadd73b0aaf8b23655a8e8c3e49
font_01_sfnt_off00011851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11851 10716 bytes
SHA-256: e3bad99a5b8373eac0a8462ac4fdf0433a8f2306ec6317fbb200be2e649055cd
font_02_sfnt_off00013085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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