Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e26836b7b0e83d…

MALICIOUS

PDF

78.0 KB Created: 2021-09-09 09:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6588740ca90d549fa763b5fc8b8d2b4 SHA-1: 6ced8f59d28f6528b0684f59b8328e581031eeec SHA-256: 88e26836b7b0e83da51484d88d4e3383701855b922df771b970b6b8326770299
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://1hozain.ru/files/userfiles/files/26008405433.pdf In PDF document text
    • https://kamwalibais.com/userfiles/file/loseluwafagimuduvipanom.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/bolexipikovitefijuwoga.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/64512980937.pdfIn PDF document text
    • http://allier-genealogie.org/File:/vexabida.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/36045589113.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/rifafijazokagakevujo.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/pewexitujobimam.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca2c778ad---65729665275.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/32959154857.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/17653843635.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/dff0aeee08843160032ef36f6008dfa2/roxegisijawuto.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161397e752da9a---fixoxuxamevazoguruxoja.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/6856295029.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/dovasifipoxofovuma.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/97913018872.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/071523195370.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613475f50b502---85407406203.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/55426898230.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efa19b700c---rofemikobib.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613774ea96fb2---10835249586.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/64536947061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=verbs+used+in+psychomotor+domainPDF 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_off0000cb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AB 17544 bytes
SHA-256: c4d4d039c52fcaf0b4c32b10cd3e9f565c13e6009b3e1ae3204d8cd3954ed25d
font_02_sfnt_off000110f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F0 11056 bytes
SHA-256: f9b408b2355795ee7b833aa5365954ee7fa04b8d3acb7154c12dc77eda13b47f

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