Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7f54a066a85afd…

MALICIOUS

PDF

72.0 KB Created: 2021-09-27 17:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a1a6137be5a2b545159be3591785330 SHA-1: 13b11c17da5aafb7759d2a42ead6236f0fc1d52e SHA-256: 9d7f54a066a85afd3cec7e7b7bdd2726ff87d49c7563ed67ad055dac0b9ecd7f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of an IP address literal in a URI further increases suspicion. While no scripts were explicitly extracted, the overall structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2478ef680f0e48e554ead7c42123da06/bubelivuli.pdf In PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210915173135.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404bf62338f---83626083772.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/52774940767.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/54014189344.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140b95da8e06---21643898897.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/10811090864.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/57967268981.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/97097451288.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/12303479117.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/8775612704.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/zowip.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/47986901335.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/21661152304.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/visiruwamokigitofulokux.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/22561945221.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/bukizimaxobomudowijek.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/dofesirapotew.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3b765nfb3orrhhovh0k4nopuff/pomuxililobolisu.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/2408599085.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/kutulawojafuruzukizi.pdfPDF link annotation
    • http://vietsaovang.com/uploads/userfiles/file/zubebodofuz.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/8127726918.pdfIn PDF document text
    • http://beiks.info/public/file/lejeke.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/gexibezagubazakelavez.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/pirukonulowoxebi.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210903073714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=genshin+impact+50+primogemsPDF 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_off0000b6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ced6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED6 16432 bytes
SHA-256: 15837d6050fc7a784c80b7c1b7eaaf99890dc70299915deacd702ace41aff46d
font_02_sfnt_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 11072 bytes
SHA-256: 4712d3c79ccc7a0cc015b2fe7bee14983b3659b357aa8cb870f9234bf2d19f5e