Malicious PDF — malware analysis report

Static analysis result for SHA-256 127f8a71bd48feff…

MALICIOUS

PDF

73.4 KB Created: 2021-09-23 20:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ea73538a16ab91de9924244a1c10b4f1 SHA-1: 6615f7831e5a73bb32832717fd1283da893c780b SHA-256: 127f8a71bd48feff37e7e3eb5a8446ab41643e9c39b411f502d49f356bbdab3c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'utm_term' parameter in one URL suggests a potential tracking or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://cructi.ru/uplcv?utm_term=hotstar+lite+mod+apk PDF link annotation
    • http://yearbookplus.com/uploads/ckfinder/files/24687266912.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d39122bf4988c6b99575a021b8203e88/mixub.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/tuzizidasigagasud.pdfIn PDF document text
    • https://akconta.com/uploads/files/18323768914.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/dugajabasida.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/radubafebakije.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148df455f98b---bibimal.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/rilubuzovokim.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/xugefu.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/wuponedaro.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/83828793092.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/badifofabu.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/rorolew.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/lt765kgg2hr58lrnrs2utsjj4g/fubalur.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210902_FCDD03B1304E99FB.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/woparetapixi.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/bixafibolawej.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3cc2eeed6---nomekudit.pdfIn PDF document text
    • http://dentistturkey.com/image/files/vusimuvoxal.pdfIn PDF document text
    • https://themalc.org/files/file/32770333886.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7652ef75a---dafowenokoges.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/72049818183.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/72313161518.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/fozokejupipivudutimex.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306cd934d13---mafugilosazunubijinomikus.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16146b85399ed1---94818381399.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109052348526781.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_off0000bdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDEA 16340 bytes
SHA-256: 0a3dac3f0d117ca547c2ffbcec6080de7ec3a38f827c6770837c6abe561e91a6
font_01_sfnt_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 10532 bytes
SHA-256: 0a38d82936cb8db0a6711e97baf3645ec4e6b6219d1d993e80ed42d092ded6e6

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