Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef40d2424756abf9…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 23:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 41000619a7247beb0be54969b5630cd7 SHA-1: 2a5c03e62f086bf2f17be2d4341c6abba9b7ee17 SHA-256: ef40d2424756abf943771b39df96378b8dd9139a10a0cf3367e6f9ad6da0619e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://brickchamber.com/ckfinder/userfiles/files/bibowixobogabovinewu.pdf In PDF document text
    • http://lukasikgroup.pl/Image/files/lulifijenorowifozefag.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/61625202395.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/pilexeja.pdfIn PDF document text
    • http://nature-revive.org/files/file/77988201972.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c98ede36b7---ziveb.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210906020245450.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/21401093145.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/20103809007.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/78982644022.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9d1a2e8940d71bdcc8a1830d4b71743b/tutajivililavofa.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/penodenetavu.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/86283982542.pdfIn PDF document text
    • http://blgjad.com/upload/files/sazusofekoxozinoluve.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/moxopoxejewexolole.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/dokodiderukokukubez.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/walusexojafiwomewujig.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/tevixoma.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fefd3cc855---xoxuxek.pdfIn PDF document text
    • http://onlinevay.com/upload/files/xarekus.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdbf394e17---56736037301.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/98703994382.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/55261751395.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/kovafikusulijetokizon.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/47185476100.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/80330268307.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/sulubazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=this+is+us+watch+online+putlockerPDF 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_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 10712 bytes
SHA-256: 53fd46fb0ffaeee1ce9cdebe07e2d6a91fef8b2fa69d076ac76804453aa01ac2
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 18168 bytes
SHA-256: 130fa57426fae2254f3fd2a15a4c5d0ccd9c0138e4546a3121f8b9a218598e7c
font_02_sfnt_off00012df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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