Malicious PDF — malware analysis report

Static analysis result for SHA-256 e405cca026e162a0…

MALICIOUS

PDF

86.8 KB Created: 2021-09-02 06:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c14cbeca3186d2e543a8af30789d2082 SHA-1: 812d86e19db098e02e30b531b9797e6b57b6e81f SHA-256: e405cca026e162a0f0b9b47273c441558d78e20467b5920bdde582d79b634ad0
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF's structure and the presence of external URIs strongly suggest it's intended as a lure, likely delivered 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 http://tz5168.com/uploadfile/image/2021/05/15/file/20210515_185729_138.pdf In PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aab69887cf9---97068563047.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d2b0a14d0---32697049584.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/busujexo.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/092ce5ee822bcd1e897b128b7dc6d70d/84868342539.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/zewenobisirafivavozafupir.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/27759620643.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d738befc2e9ce02bc9161ed7f5c8a79b/tefuradazesi.pdfIn PDF document text
    • https://rinducm1.com/contents//files/munovutorirezitubuwu.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/52018858787.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/koxanodo.pdfIn PDF document text
    • http://hhtaitung.com/CKEdit/upload/files/88187379746.pdfIn PDF document text
    • https://artbynela.com/uploads/file/fefixalevaxudirakixe.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a67fe137c8b---73720980570.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/99444540043.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/muzoturimekigevekejetafa.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/1247207605.pdfIn PDF document text
    • http://ozari-ua.com/files/file/54766084993.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16126517437550---savujelebaj.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4d16bf71f---webavafijipis.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/kiziro.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/72820270174.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1816746d3---nopito.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xamalafilofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=latest+football+scores+todayPDF 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_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 10484 bytes
SHA-256: ba9fa14d18e294ce4e14218067b1f424649400e89d502250c2f108237bab7ff2
font_01_sfnt_off000102f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B05 19828 bytes
SHA-256: 6988c959a680690247ce76572eba2006549674e67ffad69d07e1a947fe292574

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