Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79451dbabc321b0…

MALICIOUS

PDF

89.9 KB Created: 2021-09-20 04:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a952b804dfab0c6aeafce54ee47bf19 SHA-1: 92b0307689bc4158e7416fe355583e6e7e2caf20 SHA-256: e79451dbabc321b09e31d2e81cb888442989c2eaa6a0447c40cac0668558f4e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=android+ios+and+windows+mobile+are+examples+of PDF link annotation
    • https://anninhsieuthi.online/upload/files/77231532469.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/kevipefubinisikonetaxo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e87a3c1062---dakumomikavonep.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138090b7b6a5---mubanupegup.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/nenudalesofadurosa.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/nawazafalegaramofive.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/sadopumereguzanisagar.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613008201cfd7---81878244130.pdfIn PDF document text
    • http://moneymaker-gold.de/files/3638607611.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/wezapugo.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/dagobi.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/mekawi.pdfIn PDF document text
    • http://evola.it/userfiles/files/33801476069.pdfIn PDF document text
    • http://qdjshg.com/files/file/lejavikis.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210906181322.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e97801ef3a054d32d8dc047de694b280/somomerurekufetorafejabow.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/57009393311.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/xesufimigafum.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210916_6B1E47762EE61781.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/41166770221.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce3c78c1c4---92950872093.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/q98te2k2bse7hqfeaqc1n1v1c4/88524370204.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109090328044536.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_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 10872 bytes
SHA-256: e8bde103bbdc22b79697c4cc50d39ee8fdc2470355ba707383385f12e3954bb0
font_01_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A1 19980 bytes
SHA-256: 397c51dc81eee354ca7dded14727fdd05abd3d85b745371ef0860b5fd4802e95

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