Malicious PDF — malware analysis report

Static analysis result for SHA-256 706e0364cddac980…

MALICIOUS

PDF

73.0 KB Created: 2021-09-20 07:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0953bd87be41aba571c4768c281494a1 SHA-1: dd08368649c3a97fb3c28500c1b90b5caf35c220 SHA-256: 706e0364cddac98012196206402312a9483ec5789e72889274725a0bb1e4b916
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kristaldicarlo.com/userfiles/file/26444229630.pdf In PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/votejakatobisudozuz.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/36948795144.pdfIn PDF document text
    • http://orderkai.com/uploads/files/kagitaxesaze.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/97493964462.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/33932205057.pdfIn PDF document text
    • http://screen.by/images/file/fadafosuzor.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/bovanezom.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/62598107996.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/wotevevimuxazuzamefebet.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/elnmahcu5d74r00dhvjhtbqgn3/bomijawiwifibuzovujosoj.pdfIn PDF document text
    • http://cissi.it/userfiles/files/zegute.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/63374768090.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/14288095211.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/zijomexow.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090602453270554.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/45646155956.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/wenutiwi.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/10349314525.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f1983a1b8---95263640396.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462f9442c04---leziserosasofaviravaj.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/44388942010.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/zukun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=traffic+rider+with+unlimited+moneyPDF 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_off0000babf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABF 16612 bytes
SHA-256: 58277d1934b48a543b0b7f21a398d8ab6495474245019249e9ff531ea2fd485b
font_01_sfnt_off0000e5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C4 10836 bytes
SHA-256: 1ff4599d4dd9aea53ab19c0c9cf34d274c1983c065a2cc46c6ce0c1e30c76cf5
font_02_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1