Malicious PDF — malware analysis report

Static analysis result for SHA-256 4edccb9b317dce76…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 04:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5cabe7d08ce4c53cf615716fb72f5efd SHA-1: 425d88af14856cd10a3d0040b5015951d8d1259a SHA-256: 4edccb9b317dce769ca726ff73dac775b2afe0085c106659023607e6b6cb0d7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised or disposable hosting suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.prodomasa.com/ckfinder/userfiles/files/11432809966.pdf In PDF document text
    • https://nazragame.com/calisma2/files/uploads/72509748052.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/91301168424.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/92ee9c0929b0507d7f6db21951cce6ae/67572972621.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/gadiki.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/88c01eaf36a1aa80605a397edc448962/7249231772.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/lotokozaxopebojidixe.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161343e4495ddf---32119169142.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210908021031.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/nonadavid.pdfIn PDF document text
    • http://rnralpha.cz/res/file/sanixo.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/13955237251.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///peposuvi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/12f074cc49949409d78a01795fbb3e6e/foxep.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210903_091250_104.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/memare.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/22017022299.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/vexetejabawujove.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52004531743.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/fazewarinavadopuf.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/62960021432.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/tudil.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/vileriwizogew.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f6f339beea42c558053117e77be61445/papevarejuxovasonadededid.pdfIn PDF document text
    • http://oilspecchem.com/files/96946002464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mobile+lock+pattern+designPDF 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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 10916 bytes
SHA-256: de47d78d6ef66ddef5a7bf81eb3cc471171642e3610d8a60f0483928ba19a75d
font_01_sfnt_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 18400 bytes
SHA-256: 1c82163eef1f2d48074ef76454379d0913cae014f11116a9133d6dee1e96558b
font_02_sfnt_off00012338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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