Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfe8a5f8b11ffbe…

MALICIOUS

PDF

83.0 KB Created: 2021-08-18 15:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 967304d7cc67390104aa2b5d4c613931 SHA-1: b0164b86c953a40241ae811da52b647569e3fd43 SHA-256: cdfe8a5f8b11ffbe1b448a7695c7b4dc068e06d4bf8bff57151655b561d055ff
156 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 0.9972

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://bighost.vn/uploads/userfiles/file/tevuteguwuweg.pdf In PDF document text
    • http://goref.ru/files/file/64103562802.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befb940b0f0---23346329990.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/ea6aa900c6958d8bab343345183bacd5/rozanak.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160be5e5fbba65---26291575696.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/16236074621.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/15985475049.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/50721450860.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/al1c8gj2ht4b0et79k21dsbmj0/pesasinipivuvesawipudep.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/abm30apbjqlh15ltssq17vtdf4/53267402892.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a83cb18a5c85dde903866c84e2949b0f/modibegozefevesubozexu.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/fozakajajamokokisetujej.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/e2554c26c07dc4b96485e9601ba4b478/durobukaxukebuxabov.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160869fff26039---vezarutowutofavujemamifu.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/3719749680.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/mogisa.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/23098037986.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cb6e95e78---wogura.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/82988043190.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/74915530544.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160822c5d42c7b---59748379260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=h%C3%A4fele+singapore+catalogue+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_off0000de31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 17700 bytes
SHA-256: 4e44af7d8da007087f733ec2df3e040d107279df94e5208b371e2048b91214f3
font_01_sfnt_off00010b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B96 11140 bytes
SHA-256: 2e44ecba8e6e1ca280f93718775be8561977c8cb0c042f29b1bdfeab3f9fd513
font_02_sfnt_off000124fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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