Malicious PDF — malware analysis report

Static analysis result for SHA-256 20faad1e52d42ad2…

MALICIOUS

PDF

93.8 KB Created: 2021-07-29 09:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 7d9a6c8f30790e54650d29d767a93bb0 SHA-1: 1fa17123dbbe8bef9e50628cddb9497402a4dbab SHA-256: 20faad1e52d42ad2b46261b00edcf6b2c6645ebf468f02ad419cf69c7d8fb016
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is a link farm and a payment redirection lure, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the embedded URLs point to compromised domains, likely serving as part of a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://iworking.vn/uploads/files/37515011653.pdf In PDF document text
    • http://cdmatik.com/uploads/file/20522345933.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/68042631121.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf462cce0---riwafepaviveli.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/090562b8a1eb4e7e1500395e0e42f52e/71883097605.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/mizawimilitujaxules.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a737a36af0b---dipafadasa.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7de5d8fd2a3ba959c3fcd5c079721c2e/lubasobexejimile.pdfIn PDF document text
    • http://babamoleskine.com/files/file/xigaraputamegakira.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021061216300473499.pdfIn PDF document text
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/24227328185.pdfIn PDF document text
    • http://askort.pl/Upload/file/22342163844.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/2360796936.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/nutilamave.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/fa3a60f075103a187c087fe29cefafc4/noratexuguzusuzijomuzepu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9e285422fc7d7075d10814e33377ff4e/26017159076.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/lvsb4egp6dpo7qtu35cgt5ea7a/musuxegavikefim.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/32480779301.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/gajukiz.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7666801c83---reduzetit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sample+cover+letter+for+visa+application+new+zealandPDF 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_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 11068 bytes
SHA-256: 3e7e009892cb53941ae007550830ff9a088d4e7dcf473b7c1b8f6f38ac2d70b3
font_01_sfnt_off00012340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12340 17576 bytes
SHA-256: 5e7117f7811d37d8e1ffc200b03e666f438ca08fdeb62b08a80b8f0cfdee34a6
font_02_sfnt_off0001511b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1511B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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