Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b206251f6cf019…

MALICIOUS

PDF

85.9 KB Created: 2021-08-07 00:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0fbe291235e3134a147e496477958e7e SHA-1: e90e514b33b69c402e260eb9ad5f0dcbf00d4150 SHA-256: c7b206251f6cf019467e3b1b311e48dafde03e84aaedca0a98ec4ae5351e3ff0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://tvmreza.tv/ckfinder/userfiles/files/ritaxolemuvomolax.pdf In PDF document text
    • https://francemonde.news/UserFiles/file/21519273321.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/e1e67ib6c688mrbivmu1cn0nav/60714394197.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160de4ebe73fdf---funej.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/wenovo.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/94901120521.pdfIn PDF document text
    • https://menu2uplus.com/images/file/wuwiriralusalo.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/72709040190.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/87586513795.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/gupepuzasewovodigapotane.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/5b038e072db8002d68cffd63776cc453/32553597825.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3cc81f332---74369180772.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/44368453101.pdfIn PDF document text
    • http://newo.ru/files/files/mivobogidarezega.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/xudilewinuleralojamigaluj.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ff4ddf7e7---lisuleg.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/lalexugeworabozeru.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/46760409266.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/tenanutum.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/29069000309.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d2d47dba9---daxedagodako.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/zalox.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/4478462542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=scale+factor+worksheet+answer+keyPDF 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_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 10708 bytes
SHA-256: 8f0eb39e4bd8a0e8aad314f863984b1e7e94801cdbb80038fa67595bde84dbd1
font_01_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 18012 bytes
SHA-256: 9423cce83eab9d812556b8bdc5d8438de5a49778398ce24b99f3013ab987ca51
font_02_sfnt_off00013033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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