Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a22ce4fab4d2d1…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 20:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b62e7ba88a4d40e5519d4369970a88ea SHA-1: d0404eef288db1affaebc9a4d7ceef6e80319dde SHA-256: c3a22ce4fab4d2d126548a074c2077f2c9509d2af6a7e93d2ec3b3df537507aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.studioline.ie/ckfinder/userfiles/files/soginetob.pdf In PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/0c8a991549f47a2fbf8ab6c1cba5fc9d/25448670934.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/1d1da8e93ee327d69a5be4b3226643e9/49336410457.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/vnpjif92ba37h0l53cnds204ln/geruxof.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/wemogejoma.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f236850b7ecbb740698fbd4b79f2a956/72846351776.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/59565232782.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/gajopufozugidetu.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/5rr2cid6fmur99e0urtn3vin93/7380432839.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/85973674149.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/0dd55d09925042c10708d0ce888bbc5b/43416559078.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/ketate.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/cfdd1d2e8e4a18329336ac86acff38f1/75331790831.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7371441bd---vowexenejevu.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/wojedelalajiwaxetutolamu.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/bufuxasajojuloz.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/af11876e00d8aa70197f1feaa0fa5c4f/29125960751.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608564dd096d9---18723816812.pdfIn PDF document text
    • https://premiersuli.hu/files/files/jazotoxajumepixekarefazo.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/441351cebd6b004a0f5fbbb56816d339/99829514246.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///25165719872.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/nakudokerejisadawufe.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/f0ae811b339222da7dfae354a467476d/tizezoxodewi.pdfIn PDF document text
    • http://webs123.com/userfiles/file/jupotuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=secret+occult+books+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_off0000d371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD371 18000 bytes
SHA-256: 142e7b3403858a9b9296368c86ec26166c6e87530d5cb66f1198f85c723e3df2
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABF 10664 bytes
SHA-256: a6aaee1d72f34b5ff86966f7bc45005a72f764f88bc1221a2b8d28053f887272

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