Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7c46017b7a815a…

MALICIOUS

PDF

109.1 KB Created: 2021-09-01 09:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d355724fe61d6854313a1b7c54867c8 SHA-1: a7ef27a4c6120457926cedd7ec8b0af4f8e24622 SHA-256: 7a7c46017b7a815a26951019d5b065ac81e996c6103d409ebfedc8e3785aba57
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress uploads, indicating a link farm designed to mislead users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 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 http://proart.by/media/file/37426994981.pdf In PDF document text
    • https://datawire.gr/files/files/21037669594.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/burunise.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7f6408aee---8268418788.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/bibisude.pdfIn PDF document text
    • http://www.siposferenc.hu/html/45648445115.pdfIn PDF document text
    • http://krossinkeuka.org/clients/c/c6/c64aa726effa6776341672ea469011e7/File/10132875055.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/vekotisowoki.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/r2rt17ne6srbtqcsi8dap2t5r3/rojuletuzelegunojozer.pdfIn PDF document text
    • http://foxhill101.com/userimages/xibipipumilu.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/gagaxexonelofobe.pdfIn PDF document text
    • http://wwstationery.com/files/file/31165173019.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/9ee6ca54f703658ebb3dd845bb6e4584/setiriwolowozexatasitomed.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/93bb406d99340c90c3f26d35c4745bf7/96769138281.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/komewo.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/motutawimar.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/linukegebejezadij.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/42885622592.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/77213826457.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/32959032224.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/2fku234tj0hegjjsk9v0ploble/zosilikoxoxirogalimegu.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/60269631159.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/4904098450.pdfIn PDF document text
    • http://bakoca.hu/files/file/65016667770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=watch+naruto+in+chronological+orderPDF link annotation
    • 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_off00014466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14466 10576 bytes
SHA-256: 3402bd755333abd293f4391d632d6efa6ea0e978c933f427ef0e9815c193c01c
font_01_sfnt_off00015c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001745d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1745D 19208 bytes
SHA-256: 45e52db0b5571bce6699267b7118f38008ce26690bf1f485d65a93ef1334251c

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