Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4aab085437cfc9…

MALICIOUS

PDF

95.5 KB Created: 2021-09-05 12:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 700b7ab92823902423f90897b53b1644 SHA-1: 246893983301560820040e3f1bbd0387b0710867 SHA-256: af4aab085437cfc9a55636a333123c90bf55db3023006a5d4f3cb4d2f71bac10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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://cathugo-yachts.de/res/wysiwyg/file/12633940169.pdf In PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2e7b87f36975db97fd8ef1e08b7ad5e2/24077724254.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f150d3ee---74798767369.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/zejotubajonunasikakuze.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/xovasefagaxor.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/ribijejumajazede.pdfIn PDF document text
    • https://papiratisk.cz/soubory/kovovapoxedut.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/nunovujakixukijimoniki.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/39449013870.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/44167042938.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/90915382157.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/31523248251.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/1ed99148b0ede5274aafbcbfe1aeaed7/79542823331.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/84378343902.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/3np1i9o7jkc4c2g529ur0rorq4/lanimeturuxumuliwinuvubuj.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/71742998655.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4478653b61---doronigi.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/sagowapekapega.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/8136109820.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/lemutexes.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/23008011297.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/71943739476.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b9c3d093e93d3ca3614bd70ec32c2246/26930313830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=manual+de+homiletica+pdfPDF 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_off00010f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F52 10708 bytes
SHA-256: e0dad8c26454bbf3693bdc16ea6baefbf7d08491454149e5142543eb20b4bfbc
font_01_sfnt_off0001279a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279A 18860 bytes
SHA-256: c1423b4ff4f28293bcb368032dee9e019874a3e9a12b095505b187440614b8da
font_02_sfnt_off00015831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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