Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfa82fe74591736…

MALICIOUS

PDF

69.6 KB Created: 2021-09-11 14:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38cdc20cc06eb9d6033f67f00b1514cc SHA-1: 4ba3365dbeeac01481f4c0923928f8c780a392e7 SHA-256: 4cfa82fe74591736ad3aa558f14fed882afcbddb4fbb94be0586ed2280623c2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites or disposable hosting. The presence of embedded JavaScript and a high ML classifier score indicate malicious intent. The primary goal appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://oniceh.ru/uplcv?utm_term=red+spectrum+wavelength PDF link annotation
    • http://kustari.net/userfiles/file/90111288062.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/pawexasuvixexosareriziku.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/mitibamajosavaroman.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/todabusipaxerujujupiwu.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/borinogolivomo.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/nogimovafes.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/fokutijowapilifirikope.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/69476543037.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137be1dd797e---38745303253.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/dc9eaf7983749a58a2c0503d5f697f41/wiraxozizipiluful.pdfIn PDF document text
    • http://skisun.it/userfiles/files/betamefatonev.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/ratinan.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/sixozexal.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/pavaz.pdfIn PDF document text
    • http://secretinvitation.net/images/files/vunujuf.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/wogivemo.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/kamenefuvironisabiz.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/87922040899.pdfIn PDF document text
    • http://oilspecchem.com/files/gasuralemesixufofanoga.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/gelasa.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/bifekuxetazanulajabat.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/tiwun.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/55631391580.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/sedivake.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d031e72cb69e0e55bddb37856241af38/28608501033.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/60914976518.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_off0000b399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAB 14648 bytes
SHA-256: 2ab6cfab91b13b0b3cf3c13b1286814bcf5c8db5c9ba45f93af2c0232360f6a6
font_02_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 11044 bytes
SHA-256: 95f509a13675b0da8f84f400e914cb155ba07220c23cccdfc37a7139ef4f611b

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