Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e41c8338ef7d65…

MALICIOUS

PDF

86.1 KB Created: 2021-08-16 02:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e3c5021f154f4cc2bc8c94316446c39b SHA-1: c12e566c478e0d0d404774e9d81bff54cd0ea8e3 SHA-256: 99e41c8338ef7d65a1ab780e6c83f8541b84aaffadaba9e6d3cc95e0fdc020c0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The document body is heavily obfuscated and appears to be non-readable content, likely intended to mask the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6d3429fb55333a466432bcf3f63fa8b8/nefulegexeburudivasibab.pdf In PDF document text
    • https://jagominum.com/contents//files/ruxexufipofediregemutes.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/18252175781.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/pixurugoxasoxomuvawuxu.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210615_62F6055A7298B2ED.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/0k2ff1o43r06ep5ag0gmd5t41q/73590322072.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/guwobawewikixe.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/vo2vgfnrisg915ckj2vvso9e0c/76176925717.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/fn4gdbtls6o6taiu0tv38ie81o/97042456026.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2f313f40---94452298695.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f17f0e012---84994966968.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/matanitunanamex.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/86b6633614fb7232055ec3ebfedf163a/solamik.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/pesozonigix.pdfIn PDF document text
    • http://ubest.ru/images/file/94483337417.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/dimekelefologasetupudevug.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e741795c3---sokegipamesuvaxidizajurob.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/57298338299.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712fa98061e---21061778994.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/81983937373.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba9ac2927b---24166665689.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/fiwifeladuzabaxe.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b0af4ff31---kenidi.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609064cead462---juwefelarapumebiwotaguj.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762910e5e1d---48900832514.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160778e4a59987---98775699590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=is+it+worth+buying+a+pilates+reformerPDF 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_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 17296 bytes
SHA-256: 62ae8e5bd290eaaeba82cc759a104b83586e64ee272ab25db80e642e4cd48675
font_01_sfnt_off00011568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11568 11196 bytes
SHA-256: 21b2a82ad705496a8b167c2fd7f71ce2d4f7dce44a0a550d383db97a88f8a0e2
font_02_sfnt_off00012f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1