Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcfd9f5ed2bfc2c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-10 11:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e46f7a935b56a3f2a7c3b653b3cd49e0 SHA-1: 9a11f0aafc944c6de50b958b9f01853dc7292ea2 SHA-256: bfcfd9f5ed2bfc2c8b2dd4b0e8cb987f374fe719f96ce3f1297e4d001e0b2ad9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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=poco+x3+nfc+redmi+note+9+pro PDF link annotation
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/lozixun.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fc1adbb23---sabanolenew.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/84055045303.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/liseweruzupivog.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/22560461266.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/76683147266.pdfIn PDF document text
    • https://parkettworld.com/upload/files/kabezajilofitipezo.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feb649063d---79781289601.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/12189208161.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/dujupud.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/kotolataniforevasurewozo.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/wutituzizozorilowegox.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210906_200814.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/23710894706.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/db9c785b41705e012de87b1d44ea4795/rekiwebenavebosafig.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/95690487130.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/79449372294.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/fitusegikesofi.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/18945016678.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/97134825628.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/lebavugavakotir.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/85021627817.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/65389717483.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/kixesizemubebasowodonerun.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/linudagazarezime.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/jososoxe.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_off0000ce63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE63 10848 bytes
SHA-256: af6983c77cb46cae8bb4cf086983492b634dd4b1a288240e54f6d8d317aac6dc
font_01_sfnt_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 19068 bytes
SHA-256: f4964d2aa04ff68ab7799832fb9151ae273ee194f5f3149e18296ba5171db9e8
font_02_sfnt_off00011923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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