Malicious PDF — malware analysis report

Static analysis result for SHA-256 64720978d98089a5…

MALICIOUS

PDF

98.8 KB Created: 2021-07-21 01:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a2d66634880755436888b47df01894a SHA-1: 4f148f75f7cb60ac5456e72be900f3f827511f61 SHA-256: 64720978d98089a5cfb3dadd945aea2eb3adc6ba55b7334dc1bb8600b489335a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting it's part of a link farm designed to distribute malicious content or phish users. The PDF structure and the presence of multiple external URIs strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://paulsaperstein.com/userfiles/files/pidedujufifaxe.pdf In PDF document text
    • http://teechart.com/uploads/images/files/wojuxorizagobepabu.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/16857803066.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607722873e04a---69521269220.pdfIn PDF document text
    • http://alkanboya.com/files/file///73600481939.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813c737a9dc---jezijitases.pdfIn PDF document text
    • https://ivanamihic.com//files/wodatirapapagibuwa.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/3ddc80732ed92c9256e6457f2738a48c/5949104582.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/63511365032.pdfIn PDF document text
    • https://airshow-bg.com/file/dogobatijaj.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/91380521023.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/kcdm655nqs00ujiv7epldks2i9/74744463840.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072233db525c---mozolizafejesisetikibu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6834b3872---zadom.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c31bdce1492e95ebafb12f5f06706795/nojamup.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f665fc0419---80869522032.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823a9d915c1---40167258853.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/63883360498.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/76610068359.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/kosavirufipew.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/paxonukezutedapog.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/duxujilimugawiwokosifal.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c60bc92a9e---48677943786.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/596ad6a327a99afa5e6d6364d6df8076/35298833004.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a07eef9ae---jezemowose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=in+electrophoresis+dna+would+migrate+towardsPDF 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_off00011fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000137d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D7 16988 bytes
SHA-256: 47bfc2e0ae58304f0aeaf3d0176b1ef2458691acec738ab005a9d49dcdcdbfa4
font_02_sfnt_off00016439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16439 11100 bytes
SHA-256: 27e7423a2875dd83d966874bf711aabd1f312595b71c9896ae0383c7a940e002

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