Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ee7a4344acbdeb…

MALICIOUS

PDF

97.2 KB Created: 2021-08-04 06:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 73b724093341b0359467db5743c0e99e SHA-1: a6e11522777c0e6f427a7f3ba538373009a3ebca SHA-256: 27ee7a4344acbdeb310c69226584bea2c05d0e7f96386a825ee07514fbf990cb
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be directing users to potentially malicious content through a link farm hosted on disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://drafthe.ru/uplcv?utm_term=http%2F%2Fprimarias.cetechihuahua.gob.mx+respuestas+quinto+grado+matematicas PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f3417bd1---fudaguxisonoxatibo.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/garepetizoreken.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/29135172683.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/zawevixosimufut.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/sewuwixunerujot.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/79880361360.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/jobozopeviwo.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/pubiwegiwurus.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf14304e23---fawurijugevud.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/9c6c21fff84b0f95ef6583b64cfed975/seragomokupukijeluz.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d960bab533df20b2ed4a3fc037498e99/16822877708.pdfIn PDF document text
    • http://pronobile.de/catalog/file/kikak.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e144665ee85d8bdd343e3febfb0baf86/70618803983.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/97083528112.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210628142346.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6a903e7a---jirewowobivumufipi.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3c749d51a3cf71050d28d1d6c6b74bfb/64289319429.pdfIn PDF document text
    • http://thegioinoithatcamranh.com/media/ftp/file/jogeloreduzokor.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea44a65947---85910392665.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871cb549c02---75334302416.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/4797541332.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/vumijok.pdfIn PDF document text
    • https://csodamalom.hu/files/files/82091458601.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_off000113cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE2 11492 bytes
SHA-256: ba6abb529599e8a01ed539415a50f3a2ef879138b305e539b437976bfe29f49e
font_02_sfnt_off00014632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14632 18872 bytes
SHA-256: a96a89889256fae7abf76d509ffe45d920dde32a8fa7d1f2bd78460ee579172d

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