Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1685abd5e7a62d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 01:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e96b658d8e01b2773e9dc274ca60079 SHA-1: 2f2227c7f678f104b7c2cca8ad452096cb3009e6 SHA-256: 3c1685abd5e7a62de9d07bde1e3f9e687bf575589c6c342b3720432e4276be4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or potentially malicious websites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The embedded URLs suggest an attempt to redirect users to external resources for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://perfecthospitals.com/FCKeditor/file/70161623662.pdf In PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/77079095131.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1d6278d21---babadakezefog.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/c214d0e0066116d175ad0b19eb2f3c7a/sinetixokudipovajeribolag.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/92162350753.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210908_095440_142.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/lozixever.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/61042404790.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/6955658603.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9a7419930---zeguw.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/41670309678.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/50472040549.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/zewufinibudamorosabu.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/84630471549.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/4400429489.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/betosapulobok.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/kitonebalorofeg.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/54or3vc1a8m2kbjgraptaua9kc/22920403774.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/wokifugimejexamonakepuv.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/tozogowof.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/44166712892.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/wazivejidukamex.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/jamiwalalax.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1fff4e976effb2c611e8a97e33dc43b/wulatasinivimivetofivi.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/31244589336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cooking+crush+modPDF 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_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 20432 bytes
SHA-256: 911f461cf7736a8cd1b7a0e290d058b6c62219b6debcf427dedac893bd9527b3
font_01_sfnt_off00010d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001259d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259D 10600 bytes
SHA-256: 1c6419816819450d963429ed0ef0fbc7cc62fefcfcb822490e65f847c90d4002

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