Malicious PDF — malware analysis report

Static analysis result for SHA-256 d066ccf0403987d1…

MALICIOUS

PDF

86.0 KB Created: 2021-07-20 03:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21d29daa82e33bde500a3e4dbf677da3 SHA-1: 719777041f1f5be048347fc7ef64c114f2c326f1 SHA-256: d066ccf0403987d1a566a932709fbde0f7ae096965ed1f5cb5828068faf73cdf
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 and disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://hospvetcentral.pt/site/upload/file/voduzetaxuwowumadun.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/28acb8ac20a495ad661ad5bdb35d8ad0/nugalunorifobe.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/vedefuwitewedetuvimon.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9678857c3---55157044926.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/u6597q834kbnvj094ah9ct3915/vililonejemazelabupodatul.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/85125388068.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210528093641.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e780b438132b5a61685c7b78bf5a58cd/1087042180.pdfIn PDF document text
    • https://promise-land.com/upload/file/fufobovo.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1b5f7a71109a8c491fb05a03a061fc80/domewuxebomexepepebapiror.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/56724056168.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/888122d658d77316123a15eae2a58520/51904646271.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/68695963724.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/fugowezazalujepik.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dffbc650813---53111519254.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609df618ceeab---24328195295.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/24248142571.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed8dbce4ac---sanawoxem.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210519032858.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16085d6bb9a4b6---lopilapaxufofoxirusavolax.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/17649200594.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/2466c7aa591f19f7bab80f54832f6d55/24603510131.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/bepejosafuf.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/94286159038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=leanne+ford+kitchensPDF 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_off0000ed06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 17536 bytes
SHA-256: 2cc41e78d7dfda9cef0e8ea6441a7a438cb2523f0fff7780a3f6f6abfe0e6e25
font_01_sfnt_off00011ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D0 10576 bytes
SHA-256: 138081213759cab62cbab270453ee80c6688beeb81e199f1949c80c5f514d4ad

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