Malicious PDF — malware analysis report

Static analysis result for SHA-256 673457ffd07036a8…

MALICIOUS

PDF

75.6 KB Created: 2021-09-04 13:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ad32f024dbbc9909b1576fef4d7cbd2a SHA-1: e7bf132fc1f3d8cab30bcc7b7ffd0d108dd4ac25 SHA-256: 673457ffd07036a8a6045a761ee6a0b4562a0cd0a6549689344bce20385abc6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=deferred+tax+calculation+worksheet PDF link annotation
    • http://greenbrier101.com/userimages/72235813194.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88bfb1aed3---bibebanuxofonigivetoga.pdfIn PDF document text
    • http://valeneighbors.com/userimages/47674610786.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/94942001042.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4601f37cc---51781586972.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210622/1931316917.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fca54219f83---boragowum.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/25153229960.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/867a3fa6eb0725753cdf2a6212e68fc1/nodatutalidisosunew.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/fefepudofadan.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/2oi2qfgsf07e90ine3v7hcb5ci/kexozitumubeveden.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/kituzugabo.pdfIn PDF document text
    • http://fullx.net/files/texuredudewevitavokejufep.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/36324483488.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d257d7928b---mumuxubisefopikemuna.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/nimigifusanito.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/sodekididodivoxumev.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/kumuzufekiremejew.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/gunigebusufomuxuwimi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/66cd433ca2bccb4991cde4a6d2d476aa/79976395149.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160858ea0c1752---31336449985.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/nofamegitudo.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/67617921237.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/aqqh8663cmt81guj4h0gu1pgi3/lirusopi.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bfd5c5a11---78492374217.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_off0000c7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F8 15556 bytes
SHA-256: 1ef78227079b72a2faf99bf85fbb0623ee3e25b4127c0b7b70d43493386bb676
font_01_sfnt_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 10956 bytes
SHA-256: 8b303d2a83d644b5f392bc05d7ff4922804d67e15de44c8c1b77cfe0ae2ac3e6
font_02_sfnt_off000108ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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