Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb174fc6d054a5f…

MALICIOUS

PDF

83.0 KB Created: 2021-10-06 04:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 61e8fe5c313948c6cedb3942b3afc08c SHA-1: 3959e115bfc52583622e0e64d2f577d344907eda SHA-256: ecb174fc6d054a5fc32ae4b4e4a3c4d1bf671f2acb8969fa3a96ac73cabe6f51
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, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that redirect to potentially compromised WordPress upload directories. These links are likely intended to lure users to malicious sites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/310b914caae6b0039a5741dff0499508/wotobememado.pdf In PDF document text
    • http://wccflooring.com/userfiles/files/64317916458.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea1aeb60f5---46826717175.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/potubazemaxudatoweja.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/vikowij.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/18924649720.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/62e0888505d5301c11aaad205d62862c/ronekowosi.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/515c0997ac463ae68c65104e6db6a267/382204625.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161364a6057158---98795985021.pdfIn PDF document text
    • http://phanbonvino.com/media/ftp/file/36702329855.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/gidexuwigeluvarudugat.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021100322104973499.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/57810459860.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210915191520.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/lipogemebutakiwiz.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/gopinuzupagijaturupatubog.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/74811184187.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/tupipazatemisedevom.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/46673969504.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/ragepiganafapakisolagod.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/bumoreguwoburupelik.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/86749650591.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c0827e0ab389588b3c9105febe55ff92/bikuwadoxiw.pdfIn PDF document text
    • https://akconta.com/uploads/files/tefeludipod.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/5987a3e51e960927cae69fb8bc648235/xesameresijorunukuvawo.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/43804511415.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202110051651116698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=chicago+style+paraphrasePDF 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_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 18068 bytes
SHA-256: 0f56d71c889edc8407b007d3ff08bb38c237b80923d6e14059e90c2e2132856a
font_01_sfnt_off00010d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AB 10696 bytes
SHA-256: 409f1fbe3f868756420bbeaa0fc41ec44edbcf5892b30e5e9d3203ee519f7423

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