Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e2833c75ae3a1e…

MALICIOUS

PDF

97.7 KB Created: 2021-08-22 00:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d9eb398abdaa334ca055b4cc7ae400d8 SHA-1: 7f1a215fc4ef516a6ab9abcbff370084854e4aed SHA-256: 48e2833c75ae3a1e1ee704771b6f1147dbcd63178d784e486fa99979e7be1072
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the execution of JavaScript to facilitate further compromise or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=scripps+spelling+bee+school+word+list+2020 PDF link annotation
    • https://otartufo.com/ckfinder/tartufofiles/files/25693038587.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/be08bd4ee4ee0da78f0178a449cf3743/zupotamo.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/rajixumuzepamamodo.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/tibomikazigawux.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/xuteligorazisemedemu.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/tabexedif.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160860008a175f---nodemorejaxixinin.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/mokoxoxubidinorotoru.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/womijevefaja.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/tizuwofukurijome.pdfIn PDF document text
    • http://fructusartis.com/i/File/lubatapululizunikutosaxud.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/midin.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/jkb2m72sjmojpb913s32hq9ii0/30052438115.pdfIn PDF document text
    • http://mylodge-naoshima.com/70133880526.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/xerorubufifatogojo.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/87381655545.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e55a717cc5440628fb4b5c2b59c79365/76639547093.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210814065829.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084fd5a73b25---gapawomimeva.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f86d67047---xitaleg.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/qbfgbeo0k9jnm4j48sf6ufj2f5/76893394156.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bonerisilerutisijamedo.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/73275088019.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_off00011386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11386 11176 bytes
SHA-256: 514ddd58fd756ba005661334f0db277039144218aff6a358d5543b06f4669b8b
font_01_sfnt_off00012d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2F 20124 bytes
SHA-256: 5159805cb40f566389dfe456b8a77b9c09b3e0f62a04f9f23cb80573473146eb
font_02_sfnt_off000160f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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