Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bfcea9552aadc8…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 06:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b8ec79ddabd9e15729bbf62cc33593da SHA-1: 8cad86031912bd128e946507812d9a55b462b600 SHA-256: 63bfcea9552aadc82c96266c1cf889873c195044b2863cb9c85d8be64a0bd9f8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5840

Heuristics 5

  • 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
  • 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.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf207e45ad6---jiwowoxu.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/166e0b1e027d3de99a076eaf7f34ed2e/fuwegu.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/70005646914.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/tikiwodubesefir.pdfIn PDF document text
    • http://jucal.es/images/file/juzafigisewixepez.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/vdgsbj5pes34tq9s9oi5egenm5/78234619014.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/5fc90b3f933b41b8c04baff37c0a139d/86056928401.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a832dc71d84---48967011096.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/ziwabaf.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098420a76de0---zasupuvekuvaloto.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/77957743864.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05d459a08---45559791133.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/24/file/20210524_220238_113.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/98538169395.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/8062644241.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/e98cb11cb35df83949faa65e3363df1c/81724203680.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609849dce2e56---fanegozir.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747cb888eba---kinofemojokilijagaruxul.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/57276121941.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/27981621092.pdfIn PDF document text
    • http://ativn.com/upload/file/3743339907.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/64896895718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=applications+of+computer+science+pdfPDF link annotation
    • 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_off0000e4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 18168 bytes
SHA-256: 57e637f55c001c79e8ac3d8f2b7017845271ad24b243411986575b9f66515aa0
font_01_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCE 10864 bytes
SHA-256: af4439dcaf2e126af0032fab12935a92bb9d3308ed87f08779b07dab01dd754c

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