Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea52ee378145c31…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 21:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce6ba8b0ffc6d845f5f9278b63d4c08d SHA-1: 05d4d3ac54ddd68fff55b1aa8277266a517d75f2 SHA-256: 8ea52ee378145c317b240e21fc95c2372021211da4796aa5fb11dfa0b0f63757
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

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://synerhu.ru/uplcv?utm_term=can+i+use+my+phone+as+a+pc+webcam PDF link annotation
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/34471a1b31ebf5b7cb880a19f15caac6/55943870085.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/bavusirapugaluv.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/3139063518.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161416a45d1422---kidobovoxeriwunofivi.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/19144703896.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/32852086237.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/90946812352.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/makupalene.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/jenepalevaxaru.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/e11faf7f5ce3e8f51e9883facba9c6c0/32240828125.pdfIn PDF document text
    • http://goldmustang.com/files/files/96721163538.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/gosudefeso.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109080611585411.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109141646084762.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/nipivafe.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2f5ef2a1a6cb7da963d942b2cf8854b1/jakepesobavogakarot.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/33278470805.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161314431b45cc---zonanurodutamipup.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/7684347624.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/jexizepexurilusozul.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/94158284576.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/74997862074.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-2/20210902120041386620.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/geragalagepisirejab.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/jefupaperiditikoviro.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_off0000e254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE254 17732 bytes
SHA-256: 7afba90e757c693f42d9b204435d2526e1681d69b46f9b414bd1b1b067f57e2b
font_01_sfnt_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AE 10864 bytes
SHA-256: 88233e03b17f59313dd7f3e46c7cd5da892766eb1b58d2cfc78b7741f708cb5d

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