Malicious PDF — malware analysis report

Static analysis result for SHA-256 bee6d1a610bd034b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-05 19:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9f7924057bdbe4b70f33439f9a6f0ef4 SHA-1: 62ac91dd5fd31b17681f3a3fec5a5a564096f1a2 SHA-256: bee6d1a610bd034bea2f9007ba1f2885755d4cafd18abc1e14be1729b7855371
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, characteristic of link farms used to distribute malware or conduct phishing. The presence of a link to a compromised WordPress upload storage further supports this. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/kinovepuxixegogezurisi.pdf In PDF document text
    • https://thaiwoodengames.com/files/upload/files/58199359778.pdfIn PDF document text
    • http://evola.it/userfiles/files/zawudopoloxizupeve.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/pexivuwajivepejinegaraxu.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210806153837.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/vafujijatolik.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/fuzulasefojasuwuda.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/xadudagafekisata.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9545e659ef---98608414559.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/2611518182.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/mevofokewofekor.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/sudaxoz.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/dawejidajig.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/wurifimavi.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/52899281104.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/nhgik35r2hqrkh1b1rd31ijern/17194911197.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/okhsk92mggqhfh50dl5fnhg903/parigativopoj.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2f5463ecc249cba0b09011a908167b34/43044761081.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea9160678---93645132475.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/20922617327.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/364141557.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/vugijuvepuzopizafax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=opposite+words+a+to+z+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_off0000ba6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6D 16160 bytes
SHA-256: eafaffc80576dd24d4a85a8e554a472566bd5d99f73d4086aac355b42cdc6590
font_01_sfnt_off0000e366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE366 10512 bytes
SHA-256: de4cf27a023d4726787f349568690304403b29bfb94764705d3e0232ea2590f5
font_02_sfnt_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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