Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ee9d83c16e3ed0…

MALICIOUS

PDF

91.9 KB Created: 2021-10-09 12:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2c5a22841014d463ee63c9978f0204a2 SHA-1: 470e84cefb91051c3c0e22aed28f2bdb79f9721d SHA-256: 27ee9d83c16e3ed0175c16ce0ed4c04e3d76716785c3ecc5a26a38f63dee2868
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://autotronics.vn/userfiles/file/suxuvarurak.pdf In PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/14392718719.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/93708232884.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/xovuwajunu.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/20463371137.pdfIn PDF document text
    • http://fitviewer.info/files/file/birowaxakimuso.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/66150473534.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/eb020f5f815ef270bb1411f53fd0f9a4/70813778471.pdfIn PDF document text
    • http://vodova51-53.cz/files/6205721631.pdfIn PDF document text
    • http://ariege.proximeo.com/ckfinder/userfiles/files/53388142840.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/fupelagejapon.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/87671735686.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161614ac49b4de---lizafuvatupowe.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/fuzadav.pdfIn PDF document text
    • http://ahchala.com/img/file/48778513582.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/89132477978.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/kuxonubaje.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/11336a030d2f2d70f5663b895d2a5a03/52759716641.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/13835618736.pdfIn PDF document text
    • http://gardatrans.com/content/Files/bawopeperuditimixowezejut.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/421f07bo8nr5dabti71lb6ksbo/18266852328.pdfIn PDF document text
    • https://heyratacademy.ir/file/86906005717.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/96961454365.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/pifodikepikume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=number+brain+teasers+with+answersPDF 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_off0000fe34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 19872 bytes
SHA-256: 6cae44c9684391ac730d2358174eca7a22239662c16899edeab1bc344b5a00b8
font_01_sfnt_off000131e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E9 10508 bytes
SHA-256: 83f3402a3e3aceea072be8b72a01b97c8a13b76e9124cbf7b196265b757dfba9
font_02_sfnt_off000149af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1