Malicious PDF — malware analysis report

Static analysis result for SHA-256 143917a0441eafdd…

MALICIOUS

PDF

72.1 KB Created: 2021-09-28 00:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e642e4b10b9efa80aba659bf245650d0 SHA-1: 2e665611be4143213f68c683ca17a5124eb7f3d6 SHA-256: 143917a0441eafdd2ad78b10b537ae885d845558e61dfa9ad6726c26ce6434f9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://iiiemjobs.com/FCK_Editor_Images/files/40641169321.pdf In PDF document text
    • https://kaptenhoki.net/contents/files/takezi.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142972de1de8---nedokofigudakujaxawuwopi.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/jofepetatodubed.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/47283979652.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/98444369625.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/gapifemeviwugevusatekewo.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/73731604161.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf63fced44---13380472863.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/nidatojujezoke.pdfIn PDF document text
    • http://esistore.de/userfiles/file/74905029569.pdfIn PDF document text
    • http://peoplefoster.com/pliki/malix.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210914190812.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/61365702544.pdfIn PDF document text
    • http://freetds.net/userfiles/file/bituvoma.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/81063489311.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/93221962180.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161440f4756ca0---71284123579.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/srmstg639mn6kqsahrab1gshpt/ranuvonovuvim.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/tiruvibaruwizuzigiviranin.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-17/20210917040254966586.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/memibububizazuworaguziso.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/sozuwofifukaw.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/0j08du3osv6g010kd9r2d6v2b1/fosobomonofurux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pdf+to+jgpPDF 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_off0000b799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB799 17568 bytes
SHA-256: 0aeadfa7b5aa873cf220d912838d0e0ef4cad514ba9b4f80dd149a7d10032195
font_01_sfnt_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 10000 bytes
SHA-256: 0566d9585ba8ba6cef63c454a560a8488e9c95c5c2080f89368a9e991fbca6c9

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