Malicious PDF — malware analysis report

Static analysis result for SHA-256 40683d1b45e061e9…

MALICIOUS

PDF

88.2 KB Created: 2021-06-30 08:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 64b95dcfe2b41f9c4d48efd50e76258e SHA-1: 522d687861d90c7441140491acd22cdb6504c951 SHA-256: 40683d1b45e061e971db310fad70f72d0b6188d21d6ba5ac7f6696095147b6fa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a malicious PDF document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://drafthe.ru/uplcv?utm_term=when+did+adam+and+eve+walk+the+earth PDF link annotation
    • https://wineart.online/userfiles/file/52502856505.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160860b9073407---94941486727.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/392e7421f73a13f2d3a36064b290434e/wikinipezopigedojifaxazi.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/73545571339.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/gutizegagobagilivine.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/bonoro.pdfIn PDF document text
    • https://x-software.cz/data/file/26317701079.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/f2ad01bd17762b70a75b0256e2efd458/53588176023.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/waguf.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609890eb40e7c---gepuvuliwubidazavefuxe.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/29807061071.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608525caed92f---nexipewuvalorebelewevi.pdfIn PDF document text
    • http://cmtsport.com/pliki/xisusalezuwude.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/9q7jcona4563bgd8cs3hinls65/74097532891.pdfIn PDF document text
    • https://aneri12.eu/res/file/8560656210.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a51f45be2---14047565444.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/91900310824.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d428741578f---wamasukuvepuwoto.pdfIn PDF document text
    • https://yodobashi-church.com/41315069565.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/0a7311f705ccdd8f15e86bb9d9142ab2/fevudebidagisulufujo.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/fcmketdlinq9mrfbkjvjua12v6/62758590704.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/45f1203fd1562d92333ee48a764f0a47/guranatav.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ac1564168f14b88ea00812f974f6cf2a/39622003220.pdfIn PDF document text
    • 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_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAF 10464 bytes
SHA-256: e6d60403e26a4ed19b74d27cf8055d03cc848170e7dce95c7bedee2a73ca2e7d
font_02_sfnt_off00012738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12738 17004 bytes
SHA-256: 196d8d201d43ff2dff115f9424d2bc4cfee9e1f310fb57d3ec28dd660fa10e03