Malicious PDF — malware analysis report

Static analysis result for SHA-256 f660fde1f6f668d2…

MALICIOUS

PDF

78.2 KB Created: 2021-06-27 01:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f94c7b4bad8d9f981b87b47604db961e SHA-1: ee4c5fd9bb7d149ea8445478ac1dfaca410719d0 SHA-256: f660fde1f6f668d226c38d6117803da6867e461ff3569710f84e00e9a83c4763
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, but the heuristics clearly identify it as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/i36e3g479cs95v9abcgmkbukb7/jukitafagakulorakitolapi.pdf In PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/icgm5rph2cjh49am5epc5vnspi/96234130192.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6462ec6734---momumino.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/4afc60ea13eb63a85cf7ce708848fcb6/zibuvibiga.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/11926489292.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/xofupirebawozakiwatazeg.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/7a408b04b34d822a8ffe62ec9c2ca0a2/vasifujirob.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4a7495aff486127f52fc5be2ac6bf5b3/renonixipalilukiv.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/34528700059.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55829e7625---27872016040.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeaaaa944c---1522699372.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c3c030e44ee1c40ab387a5502f31b873/69600258584.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4b8c2449b---90806095957.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/pefagowigupuzibasatupomu.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae5c354f5---sevonosebigufojoboxiviram.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/84625354738.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/gesamizijiwunure.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/28609346467.pdfIn PDF document text
    • http://rayanchem.com/d/files/gotutifupew.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b89621e2---tozukelaveloto.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/763ec9bc77f54d76ae3e9dba91807fe8/xulabadubaluxeravul.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe6ef8e2ee---9897251548.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kolazugutidoluramunatot.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/81468565722.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/5shl3ri30gf1ffphtcso1tmtue/kamaxuxitodopusojulinen.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c659a87f1f6bc5d5b413947d0d4bf8ee/nakuxilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+convert+scanned+documents+to+pdfPDF 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_off0000cf3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3C 16348 bytes
SHA-256: 7fba9a101513dd6c19b6406809e8a42357aae000948c844e0683043bb2488249
font_01_sfnt_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 10976 bytes
SHA-256: 3da955a1146c6d4e8337f84db43fa39fd8b0720095e58ebb197b82fdcbb3aa64
font_02_sfnt_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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