Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ead1f92d27e65d…

MALICIOUS

PDF

78.2 KB Created: 2021-06-10 20:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2fd0b7186f936df36ed7ee7af48f787a SHA-1: f45bfe24c87073b1b1f83aa0c4b39e687e25123f SHA-256: b0ead1f92d27e65d2e49905bb31eb17606f3b1a98fbe01bfc3b51c5cbc3ee074
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external resources, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The heuristic firings indicate the PDF is designed as a link farm, likely to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://cructi.ru/uplcv?utm_term=creature+3d+watch+online PDF link annotation
    • https://childrencareandliteracysociety.org/userfiles/files/xukuwapatasejaredekipa.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7836eb91a---11478885794.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607287d766964---75107899562.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/8645f2635f5ea15fa6c7c57e088e8036/zavafofepiwatofave.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/6f0827ef9ac891e0389f83abc3773eb2/pixatibojijabexedapete.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a021c46b00d---68332094857.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/spt7kgqp3ia172cf69ijirs8av/nuvululozoligagidilinixo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/28225261846.pdfIn PDF document text
    • http://miracleschoolministries.com/survey/userfiles/files/wuluvotidazuzozugiduzaf.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/btdsjhvj154r7cisu0vu02ler7/72050601120.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/68130669271.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073f325b9bf1---bakapigaradozukixisureso.pdfIn PDF document text
    • http://huiking.cn/uploads/file/18033118215.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b754d2af004---lavazadoja.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ab36af75---4289169659.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/oa428pmv9auvm67kd4tqr9o7do/92311419801.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b1b7f31e8---44279145055.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa27ceb118e---33686706484.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 5008 bytes
SHA-256: 0dd7a1f2d751119f3bb4d259c995934929da51aad3bf70c27fcd94fa0a61f0da
font_01_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 11032 bytes
SHA-256: fa0407e9d476981de54f7a3a601287a7505e813649937112e382023c2d74861f

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