Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcde778d66eb79c9…

MALICIOUS

PDF

72.5 KB Created: 2021-09-10 20:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: baeeafa84e1ea15d653eae536fe93b79 SHA-1: 2c76977a56540fba670c7808d9d212691af26b12 SHA-256: fcde778d66eb79c9631bf4b12716824281eacaaee13f916975887f2f9494663a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=hunter+assassin+app+download PDF link annotation
    • http://klimagra.pl/images/wysiwyg_img/file/dusekitemovuvegiwikuxafu.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/zidurijenajapafimumuge.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613114ed2f614---sepab.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/vopiribasuwularasodijobe.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/bunuloj.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/66296787723.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/muret.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aed0aa943d---kilitozejokovamudetun.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/loxizazilanitosim.pdfIn PDF document text
    • http://consade.com/userfiles/file/40295778961.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/xelof.pdfIn PDF document text
    • https://electroagro.es/pub/files/24559050883.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/45801379987.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/86154592332.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/galek.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/beputojokabigo.pdfIn PDF document text
    • http://boldogelet.hu/media/fakarufuzitalafikojaxeti.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/saxowuvusibipurolupip.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b4c98f977dfcae2c8eace3a251ce13b0/57499878100.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/7203571794.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/75473483092.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630990608.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/zotemiduxadeguje.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///49944841970.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/metidivosozotinavubiwijok.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_off0000b695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB695 10564 bytes
SHA-256: 33c91c925c63f2178b7859f995c2e09fb25943e568833eb2b9ebcfb2848e3d88
font_01_sfnt_off0000cec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC8 17680 bytes
SHA-256: 3a6d5a7822bc9e939d1ef10df4fb45c44f3a5c026f15f747a5caf5f223eacd8d
font_02_sfnt_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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