Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41c4f986aeccc1e…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 21:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd468a6c9f3811a67b536f3489420e9f SHA-1: caf5c3ecee21f49932312a9896cee668ac1cc1b0 SHA-256: f41c4f986aeccc1e781463335859093d3bff63083a1e0c7ee9292c286b70a7b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external URIs and link farm heuristics, indicating a strong likelihood of directing users to malicious or compromised websites. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive links, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=alice+and+wonderland+caterpillar+name PDF link annotation
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pjp4ridltcalv28c5u56vjr5d6/28557733320.pdfIn PDF document text
    • http://canvangdientu.com/images/file/16204017781.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1e78b8095---83469959171.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/1748353363.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109110703596703.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/joromam.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/vuzisug.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/56441037933.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/15492653066.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/53161249232.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/29886425500.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/9367110675.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/zotidup.pdfIn PDF document text
    • http://beeshark.ro/app/webroot/files/userfiles/files/65268213273.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380954857c0---tajoxagenonolakefibe.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-16/20210916153141384020.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/87392863267.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/91555788284.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/43852233622.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/legafiluwakug.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109010516177884.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/jibugoxadixofavelur.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///7406932031.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614251c6e157b---63533207283.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/lavarojobaleladexavulakor.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_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 18940 bytes
SHA-256: 1df6057ba5d69baa54df77f39089263ffcafaf0fe64d197224f789548386d149
font_02_sfnt_off00013152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13152 10576 bytes
SHA-256: 097628d7a34141ee8e82445fc86bdd8bbba8a25fd000adfc64bd699d5a6f50a7