Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efa5f031c8de906…

MALICIOUS

PDF

84.1 KB Created: 2021-06-24 02:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 53befe4c904db3c024c2548ff650b29c SHA-1: 3ac25cf9c5bef9cf12c33f6e4d360fe44cb0fd68 SHA-256: 8efa5f031c8de9061ccb0e3cdf595aa3beb0fcc6319f9edc7fa061dc8ef5c4d3
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various PDF files hosted on compromised CMS upload storage, disguised as a 'premium vector background'. The presence of embedded URLs and the nature of the link farm suggest an attempt to trick users into downloading further malicious content, likely through a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/1hc4cgducauo48htompalg82vj/73264585927.pdf In PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160738317aa39a---56084495143.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/63504993131.pdfIn PDF document text
    • https://cargotavio.ru/files/file/74568039271.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d37b16a30---rebuvuzawanakoleralux.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ba9717279---87597628264.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210619_C33EE61232F539B9.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/cf9f712c3211ae88e6fc7ca2ddcdfd50/metufojodetarusilobitu.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/k4in8s19f7niava2fcv4ugukqh/11289891426.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/92676946734.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609405c75bcbf---17927405622.pdfIn PDF document text
    • http://hifi-markt.info/kunden/kronhardt/ckfinder/userfiles/files/5196226275.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/nuwelimelobebo.pdfIn PDF document text
    • https://maclashoes.it/file/56001693538.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2m9bc0j29f38louqb4ka3dddd3/78414140959.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ede1748328baed77f055dd00bf0d4ca9/zufavuga.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//84349630877.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/buzawulafukasubiduj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=premium+vector+backgroundPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 5196 bytes
SHA-256: a1e5503bf6e00e9a954351c846d0a61b24bfd66e3ef6a210627abe9b752d65cb
font_01_sfnt_off00010f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F78 10976 bytes
SHA-256: f0c1843ecccba1731465e7e9deed4543564cb83abe8b03eb68a868436557e65f
font_02_sfnt_off000134d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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