Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32d78d0d1111ddb…

MALICIOUS

PDF

70.3 KB Created: 2021-10-01 07:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1663f4d6527cf13e145a5570e47f7907 SHA-1: 10cdaaa9d9af2aa29f396a7bb5910bd18b073ce2 SHA-256: e32d78d0d1111ddbc03a17484b0a1b2d6f2d774c82306a991167b62ec511d0a7
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 websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=how+do+you+block+a+website+on+your+phone PDF link annotation
    • http://diplomat2014.ru/ckfinder/userfiles/files/96093322710.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/wafujukukaporaf.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/78378962263.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/41352624559.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/xulekevitiz.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/jupabetanuj.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/82454801514.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/zapekewuviro.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/fileka.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-19/20210919055622566942.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/gebonevawe.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/buvotuge.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/22364517238.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/larelesabami.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16133faf5cdc60---lesipojatusarejowo.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/daziferivolojeriga.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef66828488---mosoti.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/98041724323.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/wubapexudamijomosijimul.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16154538197c53---pezolosefajodipabu.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/97952346898.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/34095092234.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/74393867014.pdfIn PDF document text
    • http://one9five.com/userfiles/files/73663563715.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_off0000b00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00B 16268 bytes
SHA-256: 1b76bc808209fcfdb4bd669778c3e74f63a2f194ba1251a1c694c11b3bff7f32
font_01_sfnt_off0000d9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A6 11132 bytes
SHA-256: 083e9b54e6f0af032ea4114f3c9fdcdd68f078f6295561b8be769969f47e361d
font_02_sfnt_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1