Malicious PDF — malware analysis report

Static analysis result for SHA-256 eddc362123e0cb41…

MALICIOUS

PDF

69.7 KB Created: 2021-09-18 12:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5c27e5b8cd17f102f21282f0c88d137 SHA-1: f214daea57993612b10b8710109f523ce8083e2e SHA-256: eddc362123e0cb415554ff2130e5ee365ee9819ed20cde9ab94ed92af3f29c6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the presence of external URI links and a link farm pointing to potentially compromised hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains elements that could be interpreted as a lure for downloading content, aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=lucky+patcher+app+download+now PDF link annotation
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161320e9c46ffe---91613085197.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/nibawa.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/95310796564.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/lusobonuwumo.pdfIn PDF document text
    • https://lecachet.fr/docs/files/titevifemometu.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/19386120901.pdfIn PDF document text
    • https://casaalu.com/luutru/files/fakapoweluziwisatobi.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109130836078090.pdfIn PDF document text
    • http://xsteelstock.com/d/files/22872986890.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/uk5u9n24g7i2vq3p4rmgqd7hk2/mawurujamo.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/99148084981.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/pozupemenonupuzulopuxor.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/mevopiretenisunulu.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/piwovizidojebunal.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c6344441a3caa0b9e7c6513af64014ad/niwodixut.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/pilalulagatigobakugoganob.pdfIn PDF document text
    • http://rayanchem.com/d/files/50891219720.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/60607236070.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/45fb94dd2ba608ff7e10d42edd2fd120/48111597288.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090221102273499.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/noxusutetunituvobide.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091700263173499.pdfIn PDF document text
    • https://shidoremicrosys.com/media/38799373374.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/kinedajabubukefupixiwinem.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/69938400371.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/tidope.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_off0000b49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49D 10700 bytes
SHA-256: e3730cb44f2a38bc2289c972a42b7af168e673c1523e562b81157154394579e4
font_01_sfnt_off0000cd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD42 14380 bytes
SHA-256: f4e38e6d6043266bc45c885d9584b3838092876cb85cf1dcf30646cf4760dae1
font_02_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1