Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e7271996768592…

MALICIOUS

PDF

73.9 KB Created: 2021-09-09 23:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb24cdd77f36b8a318d627e6ebd9d88f SHA-1: a53141c952a15ff12bbef71cb53a8b217df2d8d1 SHA-256: 21e72719967685926a2c760259f2fa6b8b8d634c81d59ad95cc17a03d5cf689e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or serves malicious content. It functions as a link farm, directing users to numerous external URLs, some of which host further PDF files, suggesting a potential SEO manipulation or phishing campaign. The presence of multiple compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ckrtef9cj9ggs0lfpdb8p0elcj/duxulelepugenoditinurip.pdf In PDF document text
    • https://webtechnocrats.com/upload/file/14600048872.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/duwimuwure.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109031247351575.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/56d118aafff54c49cc5435c48dda0bec/rivoj.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613205ed4c804---80182466051.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/75537244828.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/39680532844.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021941919348086.pdfIn PDF document text
    • http://boxethai38.com/upload/file/malusekanedofalunadez.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/morolozexuk.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161352c9d8bdd0---falenibawifi.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/55318530811.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/fasaridafazogowinuti.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/49398890539.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/36137529774.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631209644f3Te.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7ec99409c---16868906695.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/74669110534.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/88419f2fc1ecd4ea56c9ce4e6665b2c0/78301732009.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/tavokagixare.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/fojepeximobemewizoj.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/kulunubag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=schaum%27s+outline+series+data+structure+pdfPDF link annotation
    • 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_off0000bca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA5 16816 bytes
SHA-256: e7f1088319a8f3f2562bbbb2937d0e1bbfb61d7b5fc264ae23d8f5cb6e6ec2b4
font_01_sfnt_off0000e822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 11096 bytes
SHA-256: 30edf5c08647cae691913c20dd4ab0a2a9da5fbfb237fe83cc964f7aadc6d457

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