Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a923b486040b34…

MALICIOUS

PDF

69.0 KB Created: 2021-09-30 10:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4519ff25a4f8363e81ea257f86bee005 SHA-1: 1587e6cb477ce4f95dc8b9a23e75f96e8031d383 SHA-256: f1a923b486040b34c8a3ace3184d42b8fa43aeba6e03bf162385584b113ff23e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm designed to lure users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffce840ae8---wiladulajada.pdf In PDF document text
    • https://abyway.lv/images/ck_images/files/30235875958.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/73416744685.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1615257ea785ca---83903886093.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/wesemujomuretefulipa.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/paleditotodisero.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/zonewojoxaxavureputiminu.pdfIn PDF document text
    • https://estoniapools.com/contents/files/34797177041.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/lajujuxatofebivawawalu.pdfIn PDF document text
    • http://parateam.cz/file/wafaduxora.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/78208933389.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/45254016014.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/doluwabejoxa.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3814e9a613f579b9b34362af71b8f850/tojajugosegugulelurovoda.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/jigafofosatawukafos.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/22034688338.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/melelujabel.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161448428c57e7---22338942507.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/pataje.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/57640066992.pdfIn PDF document text
    • https://siroyensao.com/upload/files/pabax.pdfIn PDF document text
    • http://rts-3.ru/upload/files/61811617360.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16150b1df66e3b---35105481593.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210908082034.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/17240835396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dynomite+deluxe+apkPDF 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_off0000aff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF9 10692 bytes
SHA-256: 8f58d079e82db53925d0a48a3546b18fa41d33ca1be25523cc8d1e6ef1af10e2
font_01_sfnt_off0000c87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87A 14840 bytes
SHA-256: 926bd13ea813311930158826b1c8144988a183aa1ce1e88028b0813a4d08167a
font_02_sfnt_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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