Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e95b20b6477da0…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 22:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: db1917d475966a686a817e0060f8a6eb SHA-1: 38369ed17edaa4607238ab93ec3458e47b00cfc3 SHA-256: d7e95b20b6477da0560caf3f78ec7766b11a10ca341bf20ee290a2ed7338f0c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links pointing to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0cb8164bcb2af06f1cf36f21df75356e/bukibasigapox.pdf In PDF document text
    • https://tappowine.com/file/61392579120.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/39090470153.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/sabeke.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608768a441cc5---33958389621.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/30065276678.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba01ae1a036---34479249141.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/93049982411.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/lazaterutolo.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/lotalekowedaxe.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/6ev2d3l8hroreu0km8h0eifr1c/kumawolezorokosi.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/45461259904.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/latetevunutetivisimuwap.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/63965514237.pdfIn PDF document text
    • https://majubesar.org/contents/files/revukereferivasujulabinaj.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/79bdb2715a2a51bd52e4231d50028706/logoremov.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/guzuwi.pdfIn PDF document text
    • http://brukbet.com/user_images/file/28280527953.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/xapatabibegefuwufepinod.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/4724993669.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2fe405b1c6e591858e8690cccd1a1f2c/28890146259.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/lobixomerasoxufopurafi.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbb4c10f8---kejazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=analysing+poetry+techniques+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/035bde5bccb34e0aa8bd603b6b438354/tewunudus.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_off0000c234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC234 16312 bytes
SHA-256: 1f57134a4f6a56b28a89fedc0a2143a20247d3de4b816dac156a84e184ccf16c
font_01_sfnt_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 11240 bytes
SHA-256: e9d0d9cc0454e98b1c1519d2c993d55f8b02f357d90f065139b59df7292743f2
font_02_sfnt_off000105dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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