Malicious PDF — malware analysis report

Static analysis result for SHA-256 72afea214f86d517…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 02:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15f9f933910df97ee655791eea3a05e9 SHA-1: 7ff1568372ce5014e9e21212ad6ef889802f2754 SHA-256: 72afea214f86d51748fa3bd0e9c3803ec998036074bd15158ee3e83b46a17082
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm. The primary purpose appears to be redirecting users to potentially malicious content, likely for phishing or malware distribution, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://izeninfo.net/admin/upload/files/nefumuweporikatoxa.pdf In PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/fizoguzusumabuligipi.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ba0be2b86316ebcde28fffd16ca4028c/nuxelutawezejalaninagam.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68fe82ef5---kisofinakonotugujuni.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/oc8gjmphcsd4m1iovc1hh5itf2/niruxozesixavalavevap.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427e5eec04b---sejonaxora.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/10091371769.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/gejabadureloxirubudaxufu.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/janoras.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614217a40ced7---18841403499.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210916_554D961C2CE87845.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/81781724052.pdfIn PDF document text
    • http://chikatere.com/Upload/files/7924702110.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/riletukenugumiz.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/23503944020.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/30292919470.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9f960a772---gezufulavotegisewirif.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109171445233923.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/woxovifotoxalumufuvivul.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/22918110194.pdfIn PDF document text
    • http://rotang.net/userfiles/file/54055645081.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a705cd1fd40dbaaaed4d5e14f56dbf29/jizuvolavubelupe.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/31927778259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=deep+learning+andrew+ng+pdfPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/21500303257.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_off0000d8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C3 18912 bytes
SHA-256: 928c6accedd85ea58b0f1a020c4e6ef9cc9b78ec9c814a00b96bf6acca362d15
font_01_sfnt_off00010980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12197 10376 bytes
SHA-256: ba1af261f24238a76df0cc127aefdb3c9e13a72ccb84b01c69ae5eb72261f237

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