Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec21c9767926aa9…

MALICIOUS

PDF

84.7 KB Created: 2021-08-02 22:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d823bda81282d2a2644899c92838cd9a SHA-1: f47e8ec6088ab76c772ce578a4879ae5eabd94bc SHA-256: eec21c9767926aa916d7e4131e02bb1fa1e2f1c18f03040e6394706bf4deb3f1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with a high ML classification score and ClamAV detection, strongly suggests malicious intent. The document likely aims to lure users into clicking these links, which could lead to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://fred-robin.com/ckfinder/userfiles/files/45644412393.pdf In PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0ef49fbf8---jododosupivejodesakadar.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/bavamawiw.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/voguji.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/42171770069.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/vofenivosabokozebonunek.pdfIn PDF document text
    • https://puppometalli.eu/file/17047036480.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/19780347059.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/pujolexa.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/lebepoduxekojas.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/fuzik.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/mituxolizuri.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-30/20210630163718761464.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14095725256.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/b1bd51a3d0126feeed546c53c829b0bf/zinimi.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/newidaleratakuwuxavugog.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/demegujokatuxutaxen.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/silaredegawinaremojo.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/mevib.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f8f265577---ripere.pdfIn PDF document text
    • http://dalaichau.com/files/5128937897.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/7dd3666377415611c26aea51a4af9be0/6285385727.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/11d02b23ca51bcffd80089bbd9594a88/jeluvukiwininedilivenalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=data+structures+and+algorithms+in+python+tutorialspoint+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_off0000e4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DE 17544 bytes
SHA-256: ca2d4e1327d924d9a5981988e9b7e53de2a2e9068a47636e85964edf3f518201
font_01_sfnt_off00011287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9E 11280 bytes
SHA-256: adef4861334018c1a41dd6b476ae0d5209648c09f9c90fa31abc38ff1129891a

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