Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9401c8659dc13ca…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 00:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bc1164fe8f9f06d6f87fcee73f352c69 SHA-1: e645e29b27ca9f3548c704d5d8dffdcfa2928348 SHA-256: f9401c8659dc13ca2d66f919ed79715d4f04fe4bac7bffd61d45739b9d88bae9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=jen+wilkin+genesis+pdf PDF link annotation
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/mutoban.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/qn2mi0bbsllmvm6clrkkjdo5u1/69348741699.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109081703225448.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/talodozopobabopur.pdfIn PDF document text
    • http://savemaxint.com/files/file/pikelemafugerex.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b45d09963---zojegoxolop.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/nusitanitenifotep.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/18328f89b970782a3fc4bf1dc5582de7/61696582724.pdfIn PDF document text
    • http://kunbot.com/upload/files/fufuvunejesagogupesoto.pdfIn PDF document text
    • http://apicn.net/upload/files/gutugenugel.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/wudomawamojezuje.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/toronakukigomunup.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/pakogova.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/82056664843.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/47465933410.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/bapovul.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/kopolidilu.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33912462028.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/44814544987.pdfIn PDF document text
    • http://hijoin.hu/editor_up/83498481212.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/gexen.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/jetirodaxisa.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_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 10364 bytes
SHA-256: e69e896f940f8a86fbf3f0f045f882704bf5c4096c97cd12669c5f3509866cda
font_01_sfnt_off0000ff10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 18208 bytes
SHA-256: d3bdb2032cb566ea4de2f20b1e5fe89fe6c56c1f960e9e8b6ed466802650d97d
font_02_sfnt_off00012e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1