Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a900b4fd634750…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 15:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2f9026f7c05a7e173220ae32ca391379 SHA-1: 9b10b086bee5487422b9d6fa27bb51ee4af78491 SHA-256: f7a900b4fd63475043c3d53b5aeff1f401c553770e93db80f61ad06e537c9820
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple compromised upload links and disposable hosting points to a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vanphongphamhienluong.com/upload/files/vovuforiwa.pdf In PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/jebekopope.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946ffad51c8---84430489578.pdfIn PDF document text
    • http://skomi.ru/img/files/file/89789529089.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/28448979387.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/35939594406.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/98761856139.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a2272e036---40408526595.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/40b22708ca99fa39fe3318d7fc2f63ec/26150413569.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/51417599309.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021061113134114.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/tewasupezesesaronuf.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/cfa8f88826cc47ad9f08c8a87b2dc710/36437676976.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/n3u0d4mch8bqj4a44dma1jcu9r/5197980461.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/91841160572.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ctdc53mrmc3l9vpu6618hv87s5/49669304661.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac47b6985a---61399975903.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd10eb48c---23240133531.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/kizidolozadivitumikotux.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612aa42b79577---gurage.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e743a276ef1---zadajane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=portrait+photography+poses+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/18587836239.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4D 10744 bytes
SHA-256: 7dd12cb0842e2225bf7482b75ac14e9d00e06ff17b26089bf1c453f9a63e13fb
font_02_sfnt_off000116f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F5 18304 bytes
SHA-256: 9f4348754cef4b1138ec1c9946a30c0404b4bb165c966bd9b859f8a05155f10f

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